cc: Partial tile update for one-copy raster.

cc/resources/tile_task_runner.h

Index: cc/resources/tile_task_runner.h
diff --git a/cc/resources/tile_task_runner.h b/cc/resources/tile_task_runner.h
index 70c2c25e27d56f3c0a3e188a6700aff6041068df..a2f91e637a89f085a4ca03cdb930060b06010d02 100644
--- a/cc/resources/tile_task_runner.h
+++ b/cc/resources/tile_task_runner.h
@@ -11,6 +11,7 @@
 #include "base/callback.h"
 #include "cc/resources/resource_format.h"
 #include "cc/resources/task_graph_runner.h"
+#include "ui/gfx/geometry/rect.h"
 
 namespace cc {
 class ImageDecodeTask;
@@ -18,10 +19,26 @@ class RasterTask;
 class Resource;
 class RasterBuffer;
 
+struct TileTaskData {
+  TileTaskData(const Resource* resource,
+               uint64_t new_tile_id,
+               uint64_t previous_tile_id,
+               gfx::Rect dirty_rect)
+      : resource(resource),
+        new_tile_id(new_tile_id),
+        previous_tile_id(previous_tile_id),
+        dirty_rect(dirty_rect) {}
+
+  const Resource* resource;
+  uint64_t new_tile_id;
+  uint64_t previous_tile_id;
+  gfx::Rect dirty_rect;
+};
+
 class CC_EXPORT TileTaskClient {
  public:
   virtual scoped_ptr<RasterBuffer> AcquireBufferForRaster(
-      const Resource* resource) = 0;
+      const TileTaskData& data) = 0;
   virtual void ReleaseBufferForRaster(scoped_ptr<RasterBuffer> buffer) = 0;
 
  protected: