Remove the default format from ResourcePool.

cc/resources/one_copy_tile_task_worker_pool.cc

Index: cc/resources/one_copy_tile_task_worker_pool.cc
diff --git a/cc/resources/one_copy_tile_task_worker_pool.cc b/cc/resources/one_copy_tile_task_worker_pool.cc
index d4a333fe0eccd7b8845014fb635f0c5be314f4d2..e62ddfd4727e8df3e1144b5784f36635084dbba5 100644
--- a/cc/resources/one_copy_tile_task_worker_pool.cc
+++ b/cc/resources/one_copy_tile_task_worker_pool.cc
@@ -25,14 +25,14 @@ class RasterBufferImpl : public RasterBuffer {
   RasterBufferImpl(OneCopyTileTaskWorkerPool* worker_pool,
                    ResourceProvider* resource_provider,
                    ResourcePool* resource_pool,
+                   ResourceFormat resource_format,
                    const Resource* resource)
       : worker_pool_(worker_pool),
         resource_provider_(resource_provider),
         resource_pool_(resource_pool),
         resource_(resource),
         raster_resource_(
-            resource_pool->AcquireResource(resource->size(),
-                                           resource_pool->default_format())),
+            resource_pool->AcquireResource(resource->size(), resource_format)),
         lock_(new ResourceProvider::ScopedWriteLockGpuMemoryBuffer(
             resource_provider_,
             raster_resource_->id())),
@@ -135,6 +135,8 @@ OneCopyTileTaskWorkerPool::OneCopyTileTaskWorkerPool(
       weak_ptr_factory_(this),
       task_set_finished_weak_ptr_factory_(this) {
   DCHECK(context_provider_);
+  DCHECK(resource_provider_);
+  resource_format_ = resource_provider_->best_texture_format();
 }
 
 OneCopyTileTaskWorkerPool::~OneCopyTileTaskWorkerPool() {
@@ -145,6 +147,10 @@ TileTaskRunner* OneCopyTileTaskWorkerPool::AsTileTaskRunner() {
   return this;
 }
 
+ResourceFormat OneCopyTileTaskWorkerPool::GetResourceFormat() {
+  return resource_format_;
+}
+
 void OneCopyTileTaskWorkerPool::SetClient(TileTaskRunnerClient* client) {
   client_ = client;
 }
@@ -251,9 +257,10 @@ void OneCopyTileTaskWorkerPool::CheckForCompletedTasks() {
 
 scoped_ptr<RasterBuffer> OneCopyTileTaskWorkerPool::AcquireBufferForRaster(
     const Resource* resource) {
-  DCHECK_EQ(resource->format(), resource_pool_->default_format());
+  DCHECK_EQ(resource->format(), resource_format_);
   return make_scoped_ptr<RasterBuffer>(
-      new RasterBufferImpl(this, resource_provider_, resource_pool_, resource));
+      new RasterBufferImpl(this, resource_provider_, resource_pool_,
+                           resource_format_, resource));
 }
 
 void OneCopyTileTaskWorkerPool::ReleaseBufferForRaster(