skia: Add support for CHROMIUM_image backed textures.

I created a new abstract base class TextureStorageAllocator that consumers of
Skia can subclass and pass back to Skia. When a surface is created with a
pointer to a TextureStorageAllocator, any textures it creates, or that are
derived from the original surface, will allocate and deallocate storage using
the methods on TextureStorageAllocator.

BUG=https://code.google.com/p/chromium/issues/detail?id=579664
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1623653002

Review URL: https://codereview.chromium.org/1623653002

1 files changed, 7 insertions, 1 deletions

diff --git a/src/gpu/gl/GrGLTexture.cpp b/src/gpu/gl/GrGLTexture.cpp
index 39a8d9279f..864547ae26 100644
--- a/src/gpu/gl/GrGLTexture.cpp
+++ b/src/gpu/gl/GrGLTexture.cpp
@@ -37,7 +37,13 @@ void GrGLTexture::init(const GrSurfaceDesc& desc, const IDDesc& idDesc) {
 void GrGLTexture::onRelease() {
     if (fInfo.fID) {
         if (GrGpuResource::kBorrowed_LifeCycle != fTextureIDLifecycle) {
-            GL_CALL(DeleteTextures(1, &fInfo.fID));
+            if (this->desc().fTextureStorageAllocator.fDeallocateTextureStorage) {
+                this->desc().fTextureStorageAllocator.fDeallocateTextureStorage(
+                        this->desc().fTextureStorageAllocator.fCtx,
+                        reinterpret_cast<GrBackendObject>(&fInfo));
+            } else {
+                GL_CALL(DeleteTextures(1, &fInfo.fID));
+            }
         }
         fInfo.fID = 0;
     }