Added preliminary support for tile rasterization with Ganesh

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..d74e924f2f3aab209f2f52db9394552f584da5d4
--- /dev/null
+++ b/cc/resources/gpu_rasterizer.h
@@ -0,0 +1,76 @@
+// 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_RESOURCES_GPU_RASTERIZER_H_
+#define CC_RESOURCES_GPU_RASTERIZER_H_
+
+#include "base/memory/scoped_vector.h"
+#include "cc/resources/resource_pool.h"
+#include "cc/resources/tile.h"
+
+namespace cc {
+
+class ContextProvider;
+class ResourceProvider;
+class RenderingStatsInstrumentation;
+
+class CC_EXPORT GpuRasterizerClient {
+ public:
+  virtual void OnGpuRasterTaskCompleted(
+      Tile* tile, scoped_ptr<ResourcePool::Resource> resource) = 0;
+};
+
+class CC_EXPORT GpuRasterizer {
+ public:
+  static scoped_ptr<GpuRasterizer> Create(
+      GpuRasterizerClient* client,
+      ContextProvider* context_provider,
+      ResourceProvider* resource_provider);
+  ~GpuRasterizer();
+
+  class RasterTask {
+   public:
+    RasterTask(Tile* tile, scoped_ptr<ResourcePool::Resource> resource);
+    ~RasterTask();
+
+   private:
+    friend class GpuRasterizer;
+
+    Tile* tile_;
+    scoped_ptr<ResourcePool::Resource> resource_;
+  };
+
+  typedef ScopedVector<RasterTask> RasterTaskVector;
+
+  class CC_EXPORT Queue {
+   public:
+    Queue();
+    ~Queue();
+
+    void Append(Tile* tile, scoped_ptr<ResourcePool::Resource> resource);
+
+   private:
+    friend class GpuRasterizer;
+
+    RasterTaskVector raster_tasks_;
+  };
+
+  void Rasterize(
+      const Queue& queue,
+      RenderingStatsInstrumentation* rendering_stats_instrumentation);
+
+ private:
+  GpuRasterizer(
+      GpuRasterizerClient* client,
+      ContextProvider* context_provider,
+      ResourceProvider* resource_provider);
+
+  GpuRasterizerClient* client_;
+  ContextProvider* context_provider_;
+  ResourceProvider* resource_provider_;
+};
+
+}   // namespace cc
+
+#endif  // CC_RESOURCES_GPU_RASTERIZER_H_