Added preliminary support for tile rasterization with Ganesh

cc/resources/ganesh_rasterizer.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_RESOURCES_GANESH_RASTERIZER_H_
+#define CC_RESOURCES_GANESH_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 GaneshRasterizerClient {
+ public:
+  virtual void OnGaneshRasterTaskCompleted(
+      Tile* tile, scoped_ptr<ResourcePool::Resource> resource,
+      bool was_canceled) = 0;
+};
+
+class GaneshRasterizer {
+ public:
+  class RasterTask;
+  typedef ScopedVector<RasterTask> RasterTaskVector;
+
+  static scoped_ptr<GaneshRasterizer> Create(
+      ContextProvider* context_provider,
+      ResourceProvider* resource_provider);
+  ~GaneshRasterizer();
+
+  void SetClient(GaneshRasterizerClient* client);
+
+  ResourceFormat GetResourceFormat() const { return BGRA_8888; }
+
+  RasterTask* CreateRasterTask(
+      Tile* tile, scoped_ptr<ResourcePool::Resource> resource);
+
+  void Rasterize(
+      RasterTaskVector& tasks,
+      RenderingStatsInstrumentation* rendering_stats_instrumentation);
+
+  class RasterTask {
+   public:
+    ~RasterTask() {}
+
+   private:
+    friend class GaneshRasterizer;
+
+    RasterTask(Tile* tile, scoped_ptr<ResourcePool::Resource> resource)

[vmpstr, 2013/11/22 21:29:12]

I think this (and destructor) will have to be declared out-of-line. I think
something will complain about it on some trybots.

[slavi, 2013/11/23 01:27:19]

Good catch. Done.

+      : tile_(tile), resource_(resource.Pass()) {
+    }
+
+    Tile* tile_;
+    scoped_ptr<ResourcePool::Resource> resource_;
+  };
+
+ private:
+  GaneshRasterizer(
+      ContextProvider* context_provider,
+      ResourceProvider* resource_provider);
+
+  GaneshRasterizerClient* client_;
+  ContextProvider* context_provider_;
+  ResourceProvider* resource_provider_;
+};
+
+}   // namespace cc
+
+#endif  // CC_RESOURCES_GANESH_RASTERIZER_H_