cc: Rename TileTaskClient interface to RasterBufferProvider.

cc/raster/gpu_tile_task_worker_pool.cc

Index: cc/raster/gpu_tile_task_worker_pool.cc
diff --git a/cc/raster/gpu_tile_task_worker_pool.cc b/cc/raster/gpu_tile_task_worker_pool.cc
index 858094ea218c143b2e5d180b90bc40893608b780..f34cf7af285492dc327ad086a81420d374890d40 100644
--- a/cc/raster/gpu_tile_task_worker_pool.cc
+++ b/cc/raster/gpu_tile_task_worker_pool.cc
@@ -13,7 +13,6 @@
 #include "base/trace_event/trace_event.h"
 #include "cc/playback/raster_source.h"
 #include "cc/raster/gpu_rasterizer.h"
-#include "cc/raster/raster_buffer.h"
 #include "cc/raster/scoped_gpu_raster.h"
 #include "cc/resources/resource.h"
 #include "gpu/command_buffer/client/gles2_interface.h"
@@ -168,6 +167,10 @@ bool GpuTileTaskWorkerPool::GetResourceRequiresSwizzle(
   return false;
 }
 
+RasterBufferProvider* GpuTileTaskWorkerPool::AsRasterBufferProvider() {
+  return this;
+}
+
 void GpuTileTaskWorkerPool::CompleteTasks(const Task::Vector& tasks) {
   for (auto& task : tasks) {
     TileTask* tile_task = static_cast<TileTask*>(task.get());