Remove the default format from ResourcePool.

cc/resources/pixel_buffer_tile_task_worker_pool.cc

 // Copyright 2013 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.
 
 #include "cc/resources/pixel_buffer_tile_task_worker_pool.h"
 
 #include <algorithm>
 
 #include "base/containers/stack_container.h"
 #include "base/debug/trace_event.h"
@@ skipping 289 matching lines @@
     DCHECK_EQ(RasterTaskState::COMPLETED, state_it->type);
 
     std::swap(*state_it, raster_task_states_.back());
     raster_task_states_.pop_back();
 
     task->RunReplyOnOriginThread();
   }
   completed_raster_tasks_.clear();
 }
 
+ResourceFormat PixelBufferTileTaskWorkerPool::GetResourceFormat() {
+  return resource_provider_->memory_efficient_texture_format();
+}
+
 scoped_ptr<RasterBuffer> PixelBufferTileTaskWorkerPool::AcquireBufferForRaster(
     const Resource* resource) {
   return make_scoped_ptr<RasterBuffer>(
       new RasterBufferImpl(resource_provider_, resource));
 }
 
 void PixelBufferTileTaskWorkerPool::ReleaseBufferForRaster(
     scoped_ptr<RasterBuffer> buffer) {
   // Nothing to do here. RasterBufferImpl destructor cleans up after itself.
 }
@@ skipping 397 matching lines @@
 void PixelBufferTileTaskWorkerPool::ThrottleStateAsValueInto(
     base::debug::TracedValue* throttle_state) const {
   throttle_state->SetInteger("bytes_available_for_upload",
                              max_bytes_pending_upload_ - bytes_pending_upload_);
   throttle_state->SetInteger("bytes_pending_upload", bytes_pending_upload_);
   throttle_state->SetInteger("scheduled_raster_task_count",
                              scheduled_raster_task_count_);
 }
 
 }  // namespace cc