cc: Refactor TileTaskWorkerPool.

cc/raster/gpu_raster_buffer_provider.h

Index: cc/raster/gpu_raster_buffer_provider.h
diff --git a/cc/raster/gpu_raster_buffer_provider.h b/cc/raster/gpu_raster_buffer_provider.h
new file mode 100644
index 0000000000000000000000000000000000000000..68986cb5fa9d182234f3ccc16de7fbec5569b815
--- /dev/null
+++ b/cc/raster/gpu_raster_buffer_provider.h
@@ -0,0 +1,51 @@
+// 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 CC_RASTER_GPU_RASTER_BUFFER_PROVIDER_H_
+#define CC_RASTER_GPU_RASTER_BUFFER_PROVIDER_H_
+
+#include <stdint.h>
+
+#include "base/macros.h"
+#include "cc/raster/raster_buffer_provider.h"
+
+namespace cc {
+class ContextProvider;
+class GpuRasterizer;
+class ResourceProvider;
+
+class CC_EXPORT GpuRasterBufferProvider : public RasterBufferProvider {
+ public:
+  ~GpuRasterBufferProvider() override;
+
+  static std::unique_ptr<RasterBufferProvider> Create(
+      ContextProvider* context_provider,
+      ResourceProvider* resource_provider,
+      bool use_distance_field_text,
+      int gpu_rasterization_msaa_sample_count);
+
+  // Overridden from RasterBufferProvider:
+  std::unique_ptr<RasterBuffer> AcquireBufferForRaster(
+      const Resource* resource,
+      uint64_t resource_content_id,
+      uint64_t previous_content_id) override;
+  void ReleaseBufferForRaster(std::unique_ptr<RasterBuffer> buffer) override;
+  void BarrierToSyncResources() override;
+  ResourceFormat GetResourceFormat(bool must_support_alpha) const override;
+  bool GetResourceRequiresSwizzle(bool must_support_alpha) const override;
+
+ private:
+  GpuRasterBufferProvider(ContextProvider* context_provider,
+                          ResourceProvider* resource_provider,
+                          bool use_distance_field_text,
+                          int gpu_rasterization_msaa_sample_count);
+
+  std::unique_ptr<GpuRasterizer> rasterizer_;
+
+  DISALLOW_COPY_AND_ASSIGN(GpuRasterBufferProvider);
+};
+
+}  // namespace cc
+
+#endif  // CC_RASTER_GPU_RASTER_BUFFER_PROVIDER_H_