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 d0e1e7c0de0a14f070ed9f9347a919f42831e283..726bb6f2373b065a03673bdd50b08a0810dbe7e5 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"
 
-class SkDevice;
-
 namespace skia {
 class LazyPixelRef;
 }
@@ -36,7 +34,8 @@ class CC_EXPORT RasterWorkerPoolTask
   // Returns true if |device| was written to. False indicate that
   // the content of |device| is undefined and the resource doesn't
   // need to be initialized.
-  virtual bool RunOnWorkerThread(SkDevice* 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);
@@ -197,7 +196,8 @@ 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,