cc: GPU rasterize tiles synchronously in PrepareToDraw.

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
new file mode 100644
index 0000000000000000000000000000000000000000..2fe6be298153ae7bb76b1315d078bea424a1dbaa
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+++ b/cc/resources/gpu_rasterizer.h
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+// 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_RESOURCES_GPU_RASTERIZER_H_
+#define CC_RESOURCES_GPU_RASTERIZER_H_
+
+#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"
+
+namespace cc {
+
+class ContextProvider;
+class ResourceProvider;
+
+class CC_EXPORT GpuRasterizer : public Rasterizer {
+ public:
+  ~GpuRasterizer();
+
+  static scoped_ptr<GpuRasterizer> Create(ContextProvider* context_provider,
+                                          ResourceProvider* resource_provider,
+                                          bool use_distance_field_text,
+                                          bool tile_prepare_enabled);
+  PrepareTilesMode GetPrepareTilesMode() override;
+  void RasterizeTiles(
+      const TileVector& tiles,
+      ResourcePool* resource_pool,
+      const UpdateTileDrawInfoCallback& update_tile_draw_info) override;
+
+ private:
+  GpuRasterizer(ContextProvider* context_provider,
+                ResourceProvider* resource_provider,
+                bool use_distance_filed_text,
+                bool tile_prepare_enabled);
+
+  using ResourceWriteLocks =
+      ScopedPtrVector<ResourceProvider::ScopedWriteLockGr>;
+
+  void PerformSolidColorAnalysis(const Tile* tile,
+                                 RasterSource::SolidColorAnalysis* analysis);
+  void AddToMultiPictureDraw(const Tile* tile,
+                             const ScopedResource* resource,
+                             ResourceWriteLocks* locks);
+
+  ContextProvider* context_provider_;
+  ResourceProvider* resource_provider_;
+  SkMultiPictureDraw multi_picture_draw_;
+
+  bool use_distance_field_text_;
+  bool tile_prepare_enabled_;
+
+  DISALLOW_COPY_AND_ASSIGN(GpuRasterizer);
+};
+
+}  // namespace cc
+
+#endif  // CC_RESOURCES_GPU_RASTERIZER_H_