Revert of GN (patchset #12 id:220001 of https://codereview.chromium.org/2087593002/ )

Reason for revert:
gclient not happy on some bots

Original issue's description:
> GN
>
> What we've got here is a little GN MVP.  It's lacking any knobs and doesn't yet build anything but libskia, zlib, libpng, and libjpeg-turbo.  I've been hopping back and forth between Linux at work and Mac at home.  These seem to be at least partially working, enough to build and run cmake/example.cpp.
>
> The xcode backend seems to work.  From here, we can start exploring how to handle other backends (cmake,Android make, Google3).  There are a couple things I want to try:
>   - add another backend like vs or xcode to GN directly
>   - intercept via a custom toolchain
>   - reverse from ninja -t commands
> That last option seems kind of fun.
>
> This tries to piggyback on Chrome's GN setup as much as possible.  Chrome's got quite a lot figured out, and we're basically required to do this if we want to have a single GN build system shareable by Chrome, our bots, and other clients.
>
> This pulls in some new DEPS:
>    - build: Chrome's GN configuration, and much more
>    - buildtools: hashes for gn binary, pulled via hooks
>    - tools/clang: hashes for Chrome's clang, pulled via hooks into third_party/llvm-build
> It additionally symlinks tools/gyp to third_party/externals/gyp.  GN pulls some stuff from tools/gyp on Mac.
>
> Have not yet tried building for Windows, Android, or iOS.
>
> BUG=skia:
> GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2087593002
>
> Committed: https://skia.googlesource.com/skia/+/1d8de594f126b9a80bd8f8fa2005e90faf3b5b17

TBR=bsalomon@google.com,mtklein@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:

Review-Url: https://codereview.chromium.org/2088253002

7 files changed, 0 insertions, 464 deletions

diff --git a/.gitignore b/.gitignore
index ad2470efa9..9fb5a30db8 100644
--- a/.gitignore
+++ b/.gitignore
@@ -30,8 +30,3 @@ third_party/externals
 tools/skp/page_sets/data/*.json
 tools/skp/page_sets/data/*.wpr
 xcodebuild
-
-build
-buildtools
-tools/clang
-third_party/llvm-build
diff --git a/.gn b/.gn
deleted file mode 100644
index c6fefbae8d..0000000000
--- a/.gn
+++ /dev/null
@@ -1 +0,0 @@
-buildconfig = "//build/config/BUILDCONFIG.gn"
diff --git a/BUILD.gn b/BUILD.gn
deleted file mode 100644
index 9af046af6e..0000000000
--- a/BUILD.gn
+++ /dev/null
@@ -1,265 +0,0 @@
-# Copyright 2016 Google Inc.
-#
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
-import("build/config/linux/pkg_config.gni")
-
-declare_args() {
-}
-
-# Skia public API, generally provided by :skia.
-config("skia_public") {
-  include_dirs = [
-    "include/c",
-    "include/config",
-    "include/core",
-    "include/effects",
-    "include/gpu",
-    "include/images",
-    "include/lazy",
-    "include/pathops",
-    "include/ports",
-    "include/utils",
-    "include/utils/mac",
-  ]
-  defines = [ "SKIA_DLL" ]
-}
-
-# Skia internal APIs, used by Skia itself and a few test tools.
-config("skia_private") {
-  visibility = [ ":*" ]
-
-  include_dirs = [
-    "include/private",
-    "src/c",
-    "src/config",
-    "src/core",
-    "src/effects",
-    "src/gpu",
-    "src/image",
-    "src/images",
-    "src/lazy",
-    "src/opts",
-    "src/pathops",
-    "src/ports",
-    "src/sfnt",
-    "src/utils",
-    "third_party/etc1",
-    "third_party/ktx",
-  ]
-}
-
-# Any code that's linked into Skia-the-library should use this config via += skia_library_configs.
-config("skia_library") {
-  visibility = [ ":*" ]
-
-  cflags = [
-    "-Winit-self",
-    "-Wpointer-arith",
-    "-Wsign-compare",
-    "-Wvla",
-    "-fstrict-aliasing",
-  ]
-  cflags_cc = [ "-Wnon-virtual-dtor" ]
-
-  defines = [ "SKIA_IMPLEMENTATION=1" ]
-}
-
-skia_library_configs = [
-  ":skia_public",
-  ":skia_private",
-  ":skia_library",
-]
-
-# Chrome's GN environment is mostly helpful, but a couple default configs tend to get in the way.
-unwanted_configs = [
-  "//build/config/clang:find_bad_constructs",  # Chrome style checks.
-  "//build/config:feature_flags",  # A bunch of #defines we don't care about.
-]
-
-core_gypi = exec_script("build/gypi_to_gn.py",
-                        [
-                          rebase_path("gyp/core.gypi"),
-                          "--replace=<(skia_include_path)=include",
-                          "--replace=<(skia_src_path)=src",
-                        ],
-                        "scope",
-                        [ "gyp/core.gypi" ])
-
-effects_gypi = exec_script("build/gypi_to_gn.py",
-                           [
-                             rebase_path("gyp/effects.gypi"),
-                             "--replace=<(skia_include_path)=include",
-                             "--replace=<(skia_src_path)=src",
-                           ],
-                           "scope",
-                           [ "gyp/effects.gypi" ])
-
-gpu_gypi = exec_script("build/gypi_to_gn.py",
-                       [
-                         rebase_path("gyp/gpu.gypi"),
-                         "--replace=<(skia_include_path)=include",
-                         "--replace=<(skia_src_path)=src",
-                       ],
-                       "scope",
-                       [ "gyp/gpu.gypi" ])
-
-opts_gypi = exec_script("build/gypi_to_gn.py",
-                        [
-                          rebase_path("gyp/opts.gypi"),
-                          "--replace=<(skia_include_path)=include",
-                          "--replace=<(skia_src_path)=src",
-                        ],
-                        "scope",
-                        [ "gyp/opts.gypi" ])
-
-pdf_gypi = exec_script("build/gypi_to_gn.py",
-                       [
-                         rebase_path("gyp/pdf.gypi"),
-                         "--replace=<(skia_include_path)=include",
-                         "--replace=<(skia_src_path)=src",
-                       ],
-                       "scope",
-                       [ "gyp/pdf.gypi" ])
-
-utils_gypi = exec_script("build/gypi_to_gn.py",
-                         [
-                           rebase_path("gyp/utils.gypi"),
-                           "--replace=<(skia_include_path)=include",
-                           "--replace=<(skia_src_path)=src",
-                         ],
-                         "scope",
-                         [ "gyp/utils.gypi" ])
-
-source_set("opts_ssse3") {
-  configs += skia_library_configs
-  configs -= unwanted_configs
-
-  sources = opts_gypi.ssse3_sources
-  cflags = [ "-mssse3" ]
-}
-
-source_set("opts_sse41") {
-  configs += skia_library_configs
-  configs -= unwanted_configs
-
-  sources = opts_gypi.sse41_sources
-  cflags = [ "-msse4.1" ]
-}
-
-component("skia") {
-  public_configs = [ ":skia_public" ]
-  configs += skia_library_configs
-  configs -= unwanted_configs
-
-  deps = [
-    ":opts_sse41",
-    ":opts_ssse3",
-    "third_party:zlib",
-  ]
-
-  libs = []
-
-  sources = []
-  sources += core_gypi.sources
-  sources += effects_gypi.sources
-  sources += gpu_gypi.skgpu_sources
-  sources += opts_gypi.sse2_sources
-  sources += pdf_gypi.sources
-  sources += utils_gypi.sources
-  sources += [
-    "src/images/SkImageEncoder.cpp",
-    "src/images/SkImageEncoder_Factory.cpp",
-    "src/ports/SkDiscardableMemory_none.cpp",
-    "src/ports/SkGlobalInitialization_default.cpp",
-    "src/ports/SkImageGenerator_none.cpp",
-    "src/ports/SkMemory_malloc.cpp",
-    "src/ports/SkOSFile_stdio.cpp",
-    "src/sfnt/SkOTTable_name.cpp",
-    "src/sfnt/SkOTUtils.cpp",
-    "src/utils/mac/SkStream_mac.cpp",
-    "third_party/etc1/etc1.cpp",
-    "third_party/ktx/ktx.cpp",
-  ]
-
-  if (is_win) {
-    sources += [
-      "src/ports/SkDebug_win.cpp",
-      "src/ports/SkFontHost_win.cpp",
-      "src/ports/SkFontMgr_win_dw.cpp",
-      "src/ports/SkFontMgr_win_dw_factory.cpp",
-      "src/ports/SkImageEncoder_WIC.cpp",
-      "src/ports/SkImageGeneratorWIC.cpp",
-      "src/ports/SkOSFile_win.cpp",
-      "src/ports/SkScalerContext_win_dw.cpp",
-      "src/ports/SkTLS_win.cpp",
-      "src/ports/SkTypeface_win_dw.cpp",
-    ]
-  } else {
-    sources += [
-      "src/ports/SkDebug_stdio.cpp",
-      "src/ports/SkOSFile_posix.cpp",
-      "src/ports/SkTLS_pthread.cpp",
-    ]
-  }
-
-  if (is_linux) {
-    deps += [
-      ":fontconfig",
-      ":freetype2",
-      "third_party:libjpeg-turbo",
-      "third_party:libpng",
-    ]
-    sources += [
-      "src/fonts/SkFontMgr_fontconfig.cpp",
-      "src/images/SkJPEGImageEncoder.cpp",
-      "src/images/SkJPEGWriteUtility.cpp",
-      "src/images/SkPNGImageEncoder.cpp",
-      "src/ports/SkFontConfigInterface_direct.cpp",
-      "src/ports/SkFontConfigInterface_direct_factory.cpp",
-      "src/ports/SkFontHost_FreeType.cpp",
-      "src/ports/SkFontHost_FreeType_common.cpp",
-      "src/ports/SkFontHost_fontconfig.cpp",
-    ]
-  }
-
-  if (is_mac) {
-    sources += [
-      "src/ports/SkFontHost_mac.cpp",
-      "src/ports/SkImageEncoder_CG.cpp",
-      "src/ports/SkImageGeneratorCG.cpp",
-    ]
-    libs += [ "ApplicationServices.framework" ]
-  }
-}
-
-executable("example") {
-  configs -= unwanted_configs
-
-  sources = [
-    "cmake/example.cpp",
-  ]
-  deps = [
-    ":skia",
-  ]
-
-  libs = []
-  if (is_mac) {
-    libs += [ "OpenGL.framework" ]
-  }
-}
-
-pkg_config("system_freetype2") {
-  packages = [ "freetype2" ]
-}
-group("freetype2") {
-  public_configs = [ ":system_freetype2" ]
-}
-
-pkg_config("system_fontconfig") {
-  packages = [ "fontconfig" ]
-}
-group("fontconfig") {
-  public_configs = [ ":system_fontconfig" ]
-}
diff --git a/DEPS b/DEPS
index 539b6a81be..9504771f1c 100644
--- a/DEPS
+++ b/DEPS
@@ -3,10 +3,6 @@ use_relative_paths = True
 # Dependencies on outside packages.
 #
 deps = {
-  "build":  "https://chromium.googlesource.com/chromium/src/build.git@54b609cc558d57003c7a7d657edcc25a3879bf78",
-  "buildtools": "https://chromium.googlesource.com/chromium/buildtools.git@3780bc523aad1d68a5bd00e05c453a80b2ba0b35",
-  "tools/clang": "https://chromium.googlesource.com/chromium/src/tools/clang.git@ea64c667cd841b2c3268bd7dfd223269f3ea23ba",
-
   "common": "https://skia.googlesource.com/common.git@c282fe0b6e392b14f88d647cbd86e1a3ef5498e0",
 
   # There is some duplication here that might be worth cleaning up:
@@ -67,54 +63,3 @@ deps_os = {
 }
 
 recursedeps = [ "common" ]
-
-hooks = [
-  # Download GN.
-  {
-    'name': 'gn_win',
-    'action': [ 'download_from_google_storage',
-                '--quiet',
-                '--no_resume',
-                '--platform=win32',
-                '--no_auth',
-                '--bucket', 'chromium-gn',
-                '-s', 'buildtools/win/gn.exe.sha1',
-    ],
-  },
-  {
-    'name': 'gn_mac',
-    'pattern': '.',
-    'action': [ 'download_from_google_storage',
-                '--quiet',
-                '--no_resume',
-                '--platform=darwin',
-                '--no_auth',
-                '--bucket', 'chromium-gn',
-                '-s', 'buildtools/mac/gn.sha1',
-    ],
-  },
-  {
-    'name': 'gn_linux64',
-    'pattern': '.',
-    'action': [ 'download_from_google_storage',
-                '--quiet',
-                '--no_resume',
-                '--platform=linux*',
-                '--no_auth',
-                '--bucket', 'chromium-gn',
-                '-s', 'buildtools/linux64/gn.sha1',
-    ],
-  },
-  # Download Clang.
-  {
-    'name': 'clang',
-    'pattern': '.',
-    'action': [ 'python', 'tools/clang/scripts/update.py', '--if-needed' ],
-  },
-  # Download Linux sysroot.
-  {
-    'name': 'sysroot',
-    'pattern': '.',
-    'action': [ 'python', 'build/linux/sysroot_scripts/install-sysroot.py', '--arch=amd64' ],
-  },
-]
diff --git a/build_overrides/build.gni b/build_overrides/build.gni
deleted file mode 100644
index 72cf19a232..0000000000
--- a/build_overrides/build.gni
+++ /dev/null
@@ -1,3 +0,0 @@
-mac_sdk_min_build_override           = "10.10"
-mac_deployment_target_build_override = "10.7"
-
diff --git a/third_party/BUILD.gn b/third_party/BUILD.gn
deleted file mode 100644
index c631ee244d..0000000000
--- a/third_party/BUILD.gn
+++ /dev/null
@@ -1,134 +0,0 @@
-# Copyright 2016 Google Inc.
-#
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
-declare_args() {
-}
-
-# Most third_party code should disable warnings: if we don't maintain the code, warnings are noise.
-config("no_warnings") {
-  cflags = [ "-w" ]
-}
-third_party_configs = [ ":no_warnings" ]
-
-# Chrome's GN environment sets up a bunch of default configs we don't need/want here.
-unwanted_configs = [
-  "//build/config/clang:extra_warnings",
-  "//build/config/clang:find_bad_constructs",
-  "//build/config/compiler:chromium_code",
-  "//build/config:feature_flags",
-]
-
-config("zlib_public") {
-  include_dirs = [ "externals/zlib" ]
-}
-source_set("zlib") {
-  public_configs = [ ":zlib_public" ]
-  configs += third_party_configs
-  configs -= unwanted_configs
-
-  sources = [
-    "externals/zlib/adler32.c",
-    "externals/zlib/compress.c",
-    "externals/zlib/crc32.c",
-    "externals/zlib/deflate.c",
-    "externals/zlib/gzclose.c",
-    "externals/zlib/gzlib.c",
-    "externals/zlib/gzread.c",
-    "externals/zlib/gzwrite.c",
-    "externals/zlib/infback.c",
-    "externals/zlib/inffast.c",
-    "externals/zlib/inflate.c",
-    "externals/zlib/inftrees.c",
-    "externals/zlib/simd_stub.c",
-    "externals/zlib/trees.c",
-    "externals/zlib/uncompr.c",
-    "externals/zlib/zutil.c",
-  ]
-}
-
-config("libpng_public") {
-  include_dirs = [ "libpng" ]
-}
-source_set("libpng") {
-  public_configs = [ ":libpng_public" ]
-  configs += third_party_configs
-  configs -= unwanted_configs
-
-  deps = [
-    ":zlib",
-  ]
-  sources = [
-    "libpng/png.c",
-    "libpng/pngerror.c",
-    "libpng/pngget.c",
-    "libpng/pngmem.c",
-    "libpng/pngpread.c",
-    "libpng/pngread.c",
-    "libpng/pngrio.c",
-    "libpng/pngrtran.c",
-    "libpng/pngrutil.c",
-    "libpng/pngset.c",
-    "libpng/pngtrans.c",
-    "libpng/pngwio.c",
-    "libpng/pngwrite.c",
-    "libpng/pngwtran.c",
-    "libpng/pngwutil.c",
-  ]
-}
-
-config("libjpeg-turbo_config") {
-  include_dirs = [ "externals/libjpeg-turbo" ]
-}
-source_set("libjpeg-turbo") {
-  public_configs = [ ":libjpeg-turbo_config" ]
-  configs += third_party_configs
-  configs -= unwanted_configs
-
-  sources = [
-    "externals/libjpeg-turbo/jcapimin.c",
-    "externals/libjpeg-turbo/jcapistd.c",
-    "externals/libjpeg-turbo/jccoefct.c",
-    "externals/libjpeg-turbo/jccolor.c",
-    "externals/libjpeg-turbo/jcdctmgr.c",
-    "externals/libjpeg-turbo/jchuff.c",
-    "externals/libjpeg-turbo/jcinit.c",
-    "externals/libjpeg-turbo/jcmainct.c",
-    "externals/libjpeg-turbo/jcmarker.c",
-    "externals/libjpeg-turbo/jcmaster.c",
-    "externals/libjpeg-turbo/jcomapi.c",
-    "externals/libjpeg-turbo/jcparam.c",
-    "externals/libjpeg-turbo/jcphuff.c",
-    "externals/libjpeg-turbo/jcprepct.c",
-    "externals/libjpeg-turbo/jcsample.c",
-    "externals/libjpeg-turbo/jdapimin.c",
-    "externals/libjpeg-turbo/jdapistd.c",
-    "externals/libjpeg-turbo/jdcoefct.c",
-    "externals/libjpeg-turbo/jdcolor.c",
-    "externals/libjpeg-turbo/jddctmgr.c",
-    "externals/libjpeg-turbo/jdhuff.c",
-    "externals/libjpeg-turbo/jdinput.c",
-    "externals/libjpeg-turbo/jdmainct.c",
-    "externals/libjpeg-turbo/jdmarker.c",
-    "externals/libjpeg-turbo/jdmaster.c",
-    "externals/libjpeg-turbo/jdmerge.c",
-    "externals/libjpeg-turbo/jdphuff.c",
-    "externals/libjpeg-turbo/jdpostct.c",
-    "externals/libjpeg-turbo/jdsample.c",
-    "externals/libjpeg-turbo/jerror.c",
-    "externals/libjpeg-turbo/jfdctflt.c",
-    "externals/libjpeg-turbo/jfdctfst.c",
-    "externals/libjpeg-turbo/jfdctint.c",
-    "externals/libjpeg-turbo/jidctflt.c",
-    "externals/libjpeg-turbo/jidctfst.c",
-    "externals/libjpeg-turbo/jidctint.c",
-    "externals/libjpeg-turbo/jidctred.c",
-    "externals/libjpeg-turbo/jmemmgr.c",
-    "externals/libjpeg-turbo/jmemnobs.c",
-    "externals/libjpeg-turbo/jquant1.c",
-    "externals/libjpeg-turbo/jquant2.c",
-    "externals/libjpeg-turbo/jsimd_none.c",
-    "externals/libjpeg-turbo/jutils.c",
-  ]
-}
diff --git a/tools/gyp b/tools/gyp
deleted file mode 120000
index d871f5b007..0000000000
--- a/tools/gyp
+++ /dev/null
@@ -1 +0,0 @@
-../third_party/externals/gyp/
\ No newline at end of file