Revert "Re-land sksl fragment processor support"

This reverts commit c070939fd1a954b7a492bc30f0cf64a664b90181.

Reason for revert: 

This has some knock-on effects in the generation of Android.bp from our GN files.  See gn/gn_to_bp.py?  We're seeing things like "tmp/tmpsBVycx/gen/" end up in the include search path in Android.bp, which obviously don't exist there...

Original change's description:
> Re-land sksl fragment processor support
> 
> This reverts commit ed50200682e0de72c3abecaa4d5324ebcd1ed9f9.
> 
> Bug: skia:
> Change-Id: I9caa7454b391450620d6989dc472abb3cf7a2cab
> Reviewed-on: https://skia-review.googlesource.com/20965
> Reviewed-by: Ben Wagner <benjaminwagner@google.com>
> Commit-Queue: Ethan Nicholas <ethannicholas@google.com>

TBR=benjaminwagner@google.com,ethannicholas@google.com

Change-Id: I502486b5405923b322429219f4cc396a45a14cea
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: skia:
Reviewed-on: https://skia-review.googlesource.com/20990
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>

1 files changed, 22 insertions, 9 deletions

diff --git a/src/sksl/SkSLStringStream.h b/src/sksl/SkSLStringStream.h
index a8690668d2..9061432018 100644
--- a/src/sksl/SkSLStringStream.h
+++ b/src/sksl/SkSLStringStream.h
@@ -28,8 +28,12 @@ public:
         fBuffer.append((const char*) s, size);
     }
 
-    const String& str() const {
-        return fBuffer;
+    const char* data() const {
+        return fBuffer.c_str();
+    }
+
+    size_t size() const {
+        return fBuffer.size();
     }
 
     void reset() {
@@ -50,33 +54,42 @@ namespace SkSL {
 class StringStream : public OutputStream {
 public:
     void write8(uint8_t b) override {
+        SkASSERT(!fData);
         fStream.write8(b);
     }
 
     void writeText(const char* s) override {
+        SkASSERT(!fData);
         fStream.writeText(s);
     }
 
     void write(const void* s, size_t size) override {
+        SkASSERT(!fData);
         fStream.write(s, size);
     }
 
-    const String& str() const {
-        if (!fString.size()) {
-            sk_sp<SkData> data = fStream.detachAsData();
-            fString = String((const char*) data->data(), data->size());
+    const char* data() const {
+        if (!fData) {
+            fData = fStream.detachAsData();
+        }
+        return (const char*) fData->data();
+    }
+
+    size_t size() const {
+        if (!fData) {
+            fData = fStream.detachAsData();
         }
-        return fString;
+        return fData->size();
     }
 
     void reset() {
         fStream.reset();
-        fString = "";
+        fData = nullptr;
     }
 
 private:
     mutable SkDynamicMemoryWStream fStream;
-    mutable String fString;
+    mutable sk_sp<SkData> fData;
 };
 
 #endif // SKSL_STANDALONE