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..dcb7711142666a5108696ded2266c289df98751a
--- /dev/null
+++ b/cc/resources/gpu_rasterizer.h
@@ -0,0 +1,62 @@
+// 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,
+      bool was_canceled) = 0;
+};
+
+class CC_EXPORT GpuRasterizer {
+ public:
+  static scoped_ptr<GpuRasterizer> Create(
+      ContextProvider* context_provider,
+      ResourceProvider* resource_provider);
+  ~GpuRasterizer();
+
+  void SetClient(GpuRasterizerClient* client);
+
+  ResourceFormat GetResourceFormat() const { return BGRA_8888; }

[reveman, 2013/11/27 00:21:38]

The GpuRasterizer doesn't care what internal format is used. It will work with
whatever format the RasterWorkerPool instance decides is most efficient. The
difference is that we never need to swizzle when sampling from gpu rasterized
textures.

Looks like we just need to separate the return value of
TileVersion::contents_swizzled() from the format.

+
+  void PushRasterTask(Tile* tile, scoped_ptr<ResourcePool::Resource> resource);
+  void FlushRasterTasks(
+      RenderingStatsInstrumentation* rendering_stats_instrumentation);
+
+ private:
+  GpuRasterizer(
+      ContextProvider* context_provider,
+      ResourceProvider* resource_provider);
+
+  struct RasterTask {
+    RasterTask(Tile* tile, scoped_ptr<ResourcePool::Resource> resource);
+    ~RasterTask();
+
+    Tile* tile_;
+    scoped_ptr<ResourcePool::Resource> resource_;
+  };
+  typedef ScopedVector<RasterTask> RasterTaskVector;
+
+  GpuRasterizerClient* client_;
+  ContextProvider* context_provider_;
+  ResourceProvider* resource_provider_;
+  RasterTaskVector raster_tasks_;
+};
+
+}   // namespace cc
+
+#endif  // CC_RESOURCES_GPU_RASTERIZER_H_