Support different formats in the same resource pool.

cc/resources/resource_provider.cc

 // Copyright 2012 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/resource_provider.h"
 
 #include <algorithm>
 #include <limits>
 
 #include "base/containers/hash_tables.h"
@@ skipping 440 matching lines @@
 
 ResourceProvider::~ResourceProvider() {
   while (!children_.empty())
     DestroyChildInternal(children_.begin(), ForShutdown);
   while (!resources_.empty())
     DeleteResourceInternal(resources_.begin(), ForShutdown);
 
   CleanUpGLIfNeeded();
 }
 
+ResourceFormat ResourceProvider::memory_efficient_texture_format(
+    ResourceFormatUsage usage) const {
+  return use_rgba_4444_texture_format_ ? RGBA_4444 : best_texture_format_;
+}
+
 bool ResourceProvider::InUseByConsumer(ResourceId id) {
   Resource* resource = GetResource(id);
   return resource->lock_for_read_count > 0 || resource->exported_count > 0 ||
          resource->lost;
 }
 
 bool ResourceProvider::IsLost(ResourceId id) {
   Resource* resource = GetResource(id);
   return resource->lost;
 }
@@ skipping 1662 matching lines @@
   ContextProvider* context_provider = output_surface_->context_provider();
   return context_provider ? context_provider->ContextGL() : NULL;
 }
 
 class GrContext* ResourceProvider::GrContext() const {
   ContextProvider* context_provider = output_surface_->context_provider();
   return context_provider ? context_provider->GrContext() : NULL;
 }
 
 }  // namespace cc