cc: Remove all traces of synchronous GPU rasterization

cc/resources/gpu_rasterizer.h

Index: cc/resources/gpu_rasterizer.h
diff --git a/cc/resources/gpu_rasterizer.h b/cc/resources/gpu_rasterizer.h
index 8c75f326d0d22ffd5e1b7cf8e5b686ec613d854d..69a200f5ad17cdd332700a3a7a75ed4ad55be27f 100644
--- a/cc/resources/gpu_rasterizer.h
+++ b/cc/resources/gpu_rasterizer.h
@@ -8,7 +8,6 @@
 #include <vector>
 
 #include "cc/base/cc_export.h"
-#include "cc/resources/rasterizer.h"
 #include "cc/resources/resource_pool.h"
 #include "cc/resources/tile.h"
 #include "third_party/skia/include/core/SkMultiPictureDraw.h"
@@ -18,27 +17,11 @@ namespace cc {
 class ContextProvider;
 class ResourceProvider;
 
-class CC_EXPORT GpuRasterizer : public Rasterizer {
+class CC_EXPORT GpuRasterizer {
  public:
-  ~GpuRasterizer() override;
+  ~GpuRasterizer();
 
-  static scoped_ptr<GpuRasterizer> Create(
-      ContextProvider* context_provider,
-      ResourceProvider* resource_provider,
-      bool use_distance_field_text,
-      bool threaded_gpu_rasterization_enabled,
-      int msaa_sample_count);
-
-  // Overriden from Rasterizer.
-  PrepareTilesMode GetPrepareTilesMode() override;
-  void RasterizeTiles(
-      const TileVector& tiles,
-      ResourcePool* resource_pool,
-      ResourceFormat resource_format,
-      const UpdateTileDrawInfoCallback& update_tile_draw_info) override;
-
-  void RasterizeSource(bool use_worker_context,
-                       ResourceProvider::ScopedWriteLockGr* write_lock,
+  void RasterizeSource(ResourceProvider::ScopedWriteLockGr* write_lock,
                        const RasterSource* raster_source,
                        const gfx::Rect& rect,
                        float scale);
@@ -49,26 +32,14 @@ class CC_EXPORT GpuRasterizer : public Rasterizer {
   GpuRasterizer(ContextProvider* context_provider,
                 ResourceProvider* resource_provider,
                 bool use_distance_filed_text,
-                bool threaded_gpu_rasterization_enabled,
                 int msaa_sample_count);
 
-  using ScopedResourceWriteLocks =
-      ScopedPtrVector<ResourceProvider::ScopedWriteLockGr>;
-
-  ContextProvider* GetContextProvider(bool worker_context);
-  void PerformSolidColorAnalysis(const Tile* tile,
-                                 RasterSource::SolidColorAnalysis* analysis);
-  void AddToMultiPictureDraw(const Tile* tile,
-                             const ScopedResource* resource,
-                             ScopedResourceWriteLocks* locks);
-
   ResourceProvider* resource_provider_;
-  SkMultiPictureDraw multi_picture_draw_;
 
   bool use_distance_field_text_;
-  bool threaded_gpu_rasterization_enabled_;
   int msaa_sample_count_;
 
+  friend class GpuTileTaskWorkerPool;
   DISALLOW_COPY_AND_ASSIGN(GpuRasterizer);
 };