Remove the default format from ResourcePool.

cc/resources/tile_task_runner.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CC_RESOURCES_TILE_TASK_RUNNER_H_
 #define CC_RESOURCES_TILE_TASK_RUNNER_H_
 
 #include <bitset>
 #include <vector>
 
@@ skipping 142 matching lines @@
   // Schedule running of tile tasks in |queue| and all dependencies.
   // Previously scheduled tasks that are not in |queue| will be canceled unless
   // already running. Once scheduled, reply callbacks are guaranteed to run for
   // all tasks even if they later get canceled by another call to
   // ScheduleTasks().
   virtual void ScheduleTasks(TileTaskQueue* queue) = 0;
 
   // Check for completed tasks and dispatch reply callbacks.
   virtual void CheckForCompletedTasks() = 0;
 
+  // Returns the format to use for the tiles.
+  virtual ResourceFormat GetResourceFormat() = 0;
+
  protected:
   virtual ~TileTaskRunner() {}
 };
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_TILE_TASK_RUNNER_H_