cc, gpu: Use RGBA when using msaa on systems that don't support BGRA

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 1196 matching lines @@
       next_id_(1),
       next_child_(1),
       default_resource_type_(RESOURCE_TYPE_BITMAP),
       use_texture_storage_ext_(false),
       use_texture_format_bgra_(false),
       use_texture_usage_hint_(false),
       use_compressed_texture_etc1_(false),
       yuv_resource_format_(LUMINANCE_8),
       max_texture_size_(0),
       best_texture_format_(RGBA_8888),
+      best_render_buffer_format_(RGBA_8888),
       use_rgba_4444_texture_format_(use_rgba_4444_texture_format),
       id_allocation_chunk_size_(id_allocation_chunk_size),
       use_sync_query_(false),
       use_persistent_map_for_gpu_memory_buffers_(
           use_persistent_map_for_gpu_memory_buffers) {
   DCHECK(output_surface_->HasClient());
   DCHECK(id_allocation_chunk_size_);
 }
 
 void ResourceProvider::Initialize() {
@@ skipping 22 matching lines @@
   use_compressed_texture_etc1_ = caps.gpu.texture_format_etc1;
   yuv_resource_format_ = caps.gpu.texture_rg ? RED_8 : LUMINANCE_8;
   use_sync_query_ = caps.gpu.sync_query;
 
   texture_uploader_ = TextureUploader::Create(gl);
   max_texture_size_ = 0;  // Context expects cleared value.
   gl->GetIntegerv(GL_MAX_TEXTURE_SIZE, &max_texture_size_);
   best_texture_format_ =
       PlatformColor::BestTextureFormat(use_texture_format_bgra_);
 
+  best_render_buffer_format_ =
+      PlatformColor::BestTextureFormat(caps.gpu.render_buffer_format_bgra8888);
+
   texture_id_allocator_.reset(
       new TextureIdAllocator(gl, id_allocation_chunk_size_));
   buffer_id_allocator_.reset(
       new BufferIdAllocator(gl, id_allocation_chunk_size_));
 }
 
 int ResourceProvider::CreateChild(const ReturnCallback& return_callback) {
   DCHECK(thread_checker_.CalledOnValidThread());
 
   Child child_info;
@@ skipping 789 matching lines @@
 }
 
 class GrContext* ResourceProvider::GrContext(bool worker_context) const {
   ContextProvider* context_provider =
       worker_context ? output_surface_->worker_context_provider()
                      : output_surface_->context_provider();
   return context_provider ? context_provider->GrContext() : NULL;
 }
 
 }  // namespace cc