cc: Adding support for RGBA_4444 tile textures

cc/resources/raster_worker_pool.h

Index: cc/resources/raster_worker_pool.h
diff --git a/cc/resources/raster_worker_pool.h b/cc/resources/raster_worker_pool.h
index a53e52ff4b2acc507c184cf640339448b6a812bc..cededc1afe4687974d8f11ff971f6bdd56921673 100644
--- a/cc/resources/raster_worker_pool.h
+++ b/cc/resources/raster_worker_pool.h
@@ -14,8 +14,6 @@
 #include "cc/resources/tile_priority.h"
 #include "cc/resources/worker_pool.h"
 #include "third_party/khronos/GLES2/gl2.h"
-// TODO(robertphillips): change this to "class SkBaseDevice;"
-#include "third_party/skia/include/core/SkDevice.h"
 
 namespace skia {
 class LazyPixelRef;
@@ -34,11 +32,12 @@ class CC_EXPORT RasterWorkerPoolTask
  public:
   typedef std::vector<scoped_refptr<WorkerPoolTask> > TaskVector;
 
-  // Returns true if |device| was written to. False indicate that
-  // the content of |device| is undefined and the resource doesn't
+  // Returns true if |buffer| was written to. False indicate that
+  // the content of |buffer| is undefined and the resource doesn't
   // need to be initialized.
-  virtual bool RunOnWorkerThread(SkBaseDevice* device,
-                                 unsigned thread_index) = 0;
+  virtual bool RunOnWorkerThread(unsigned thread_index,
+                                 void* buffer,
+                                 gfx::Size size) = 0;
   virtual void CompleteOnOriginThread() = 0;
 
   void DidRun(bool was_canceled);
@@ -202,7 +201,8 @@ class CC_EXPORT RasterWorkerPool : public WorkerPool {
       int source_frame_number,
       RenderingStatsInstrumentation* rendering_stats,
       const RasterTask::Reply& reply,
-      Task::Set* dependencies);
+      Task::Set* dependencies,
+      bool use_16bit_tiles);
 
   static Task CreateImageDecodeTask(
       skia::LazyPixelRef* pixel_ref,