cc: Refactor TileTaskWorkerPool.

cc/raster/zero_copy_raster_buffer_provider.h

+// Copyright 2013 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_ZERO_COPY_RASTER_BUFFER_PROVIDER_H_
+#define CC_RASTER_ZERO_COPY_RASTER_BUFFER_PROVIDER_H_
+
+#include <stdint.h>
+
+#include "base/macros.h"
+#include "base/memory/weak_ptr.h"
+#include "base/values.h"
+#include "cc/raster/raster_buffer_provider.h"
+
+namespace base {
+namespace trace_event {
+class ConvertableToTraceFormat;
+}
+}
+
+namespace cc {
+class ResourceProvider;
+
+class CC_EXPORT ZeroCopyRasterBufferProvider : public RasterBufferProvider {
+ public:
+  ~ZeroCopyRasterBufferProvider() override;
+
+  static std::unique_ptr<RasterBufferProvider> Create(
+      ResourceProvider* resource_provider,
+      ResourceFormat preferred_tile_format);
+
+  // 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 OrderingBarrier() override;
+  ResourceFormat GetResourceFormat(bool must_support_alpha) const override;
+  bool GetResourceRequiresSwizzle(bool must_support_alpha) const override;
+  void Shutdown() override;
+
+ protected:
+  ZeroCopyRasterBufferProvider(ResourceProvider* resource_provider,
+                               ResourceFormat preferred_tile_format);
+
+ private:
+  std::unique_ptr<base::trace_event::ConvertableToTraceFormat> StateAsValue()
+      const;
+
+  ResourceProvider* resource_provider_;
+  ResourceFormat preferred_tile_format_;
+
+  DISALLOW_COPY_AND_ASSIGN(ZeroCopyRasterBufferProvider);
+};
+
+}  // namespace cc
+
+#endif  // CC_RASTER_ZERO_COPY_RASTER_BUFFER_PROVIDER_H_