Introduce CompositorDependencies for RenderWidgetCompositor.

content/renderer/gpu/compositor_dependencies_impl.h

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CONTENT_RENDERER_GPU_COMPOSITOR_DEPENDENCIES_IMPL_H_
+#define CONTENT_RENDERER_GPU_COMPOSITOR_DEPENDENCIES_IMPL_H_
+
+#include "content/renderer/gpu/compositor_dependencies.h"
+
+namespace content {
+class RenderThreadImpl;
+
+class CompositorDependenciesImpl : public CompositorDependencies {
+ public:
+  explicit CompositorDependenciesImpl(RenderThreadImpl* render_thread);

[piman, 2014/12/15 19:09:02]

That works, or RenderThreadImpl could directly implement CompositorDependencies.
Whatever works :)

+  bool IsImplSidePaintingEnabled() override;
+  bool IsGpuRasterizationForced() override;
+  bool IsGpuRasterizationEnabled() override;
+  bool IsLcdTextEnabled() override;
+  bool IsDistanceFieldTextEnabled() override;
+  bool IsZeroCopyEnabled() override;
+  bool IsOneCopyEnabled() override;
+  uint32 GetImageTextureTarget() override;
+  scoped_refptr<base::SingleThreadTaskRunner>
+  GetCompositorMainThreadTaskRunner() override;
+  scoped_refptr<base::SingleThreadTaskRunner>
+  GetCompositorImplThreadTaskRunner() override;
+  cc::SharedBitmapManager* GetSharedBitmapManager() override;
+  gpu::GpuMemoryBufferManager* GetGpuMemoryBufferManager() override;
+  RendererScheduler* GetRendererScheduler() override;
+  cc::ContextProvider* GetSharedMainThreadContextProvider() override;
+  scoped_ptr<cc::BeginFrameSource> CreateExternalBeginFrameSource(
+      int routing_id) override;
+
+ private:
+  RenderThreadImpl* render_thread_;
+};
+
+}  // namespace content
+
+#endif  // CONTENT_RENDERER_GPU_COMPOSITOR_DEPENDENCIES_IMPL_H_