cc: Rename TileTaskClient interface to RasterBufferProvider.

cc/raster/bitmap_tile_task_worker_pool.cc

Index: cc/raster/bitmap_tile_task_worker_pool.cc
diff --git a/cc/raster/bitmap_tile_task_worker_pool.cc b/cc/raster/bitmap_tile_task_worker_pool.cc
index a24b1a23b13d3ac9f1ee89b5b01a06fb524e1564..7a29df2ca13c3742c1a2012f13c95b2f2f1a0976 100644
--- a/cc/raster/bitmap_tile_task_worker_pool.cc
+++ b/cc/raster/bitmap_tile_task_worker_pool.cc
@@ -16,7 +16,6 @@
 #include "base/trace_event/trace_event_argument.h"
 #include "cc/debug/traced_value.h"
 #include "cc/playback/raster_source.h"
-#include "cc/raster/raster_buffer.h"
 #include "cc/resources/platform_color.h"
 #include "cc/resources/resource.h"
 
@@ -133,6 +132,10 @@ bool BitmapTileTaskWorkerPool::GetResourceRequiresSwizzle(
   return ResourceFormatRequiresSwizzle(GetResourceFormat(must_support_alpha));
 }
 
+RasterBufferProvider* BitmapTileTaskWorkerPool::AsRasterBufferProvider() {
+  return this;
+}
+
 std::unique_ptr<RasterBuffer> BitmapTileTaskWorkerPool::AcquireBufferForRaster(
     const Resource* resource,
     uint64_t resource_content_id,