WIP GPU scheduler + delayed activation / tile draw

cc/test/fake_raster_buffer_provider.h

Index: cc/test/fake_raster_buffer_provider.h
diff --git a/cc/test/fake_raster_buffer_provider.h b/cc/test/fake_raster_buffer_provider.h
index cb0c6342081c3fcc8ef932ffcd15a37bc4a9ddc4..68d0e0e7f92511d0a9d1f1333d46777e8b4c0e00 100644
--- a/cc/test/fake_raster_buffer_provider.h
+++ b/cc/test/fake_raster_buffer_provider.h
@@ -22,6 +22,9 @@ class FakeRasterBufferProviderImpl : public RasterBufferProvider {
       uint64_t previous_content_id) override;
   void ReleaseBufferForRaster(std::unique_ptr<RasterBuffer> buffer) override;
   void OrderingBarrier() override;
+  bool IsResourceReadyToDraw(const Resource* resource) override;
+  void SignalResourcesReadyToDraw(const std::vector<const Resource*>& resources,
+                                  const base::Closure& callback) override;
   ResourceFormat GetResourceFormat(bool must_support_alpha) const override;
   bool IsResourceSwizzleRequired(bool must_support_alpha) const override;
   bool CanPartialRasterIntoProvidedResource() const override;