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

gpu/command_buffer/service/feature_info.cc

 // Copyright (c) 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 "gpu/command_buffer/service/feature_info.h"
 
 #include <set>
 
 #include "base/command_line.h"
 #include "base/macros.h"
@@ skipping 146 matching lines @@
       ext_discard_framebuffer(false),
       angle_depth_texture(false),
       is_swiftshader(false),
       angle_texture_usage(false),
       ext_texture_storage(false),
       chromium_path_rendering(false),
       blend_equation_advanced(false),
       blend_equation_advanced_coherent(false),
       ext_texture_rg(false),
       enable_subscribe_uniform(false),
-      emulate_primitive_restart_fixed_index(false) {
+      emulate_primitive_restart_fixed_index(false),
+      ext_render_buffer_format_bgra8888(false) {
 }
 
 FeatureInfo::Workarounds::Workarounds() :
 #define GPU_OP(type, name) name(false),
     GPU_DRIVER_BUG_WORKAROUNDS(GPU_OP)
 #undef GPU_OP
     max_texture_size(0),
     max_cube_map_texture_size(0),
     max_fragment_uniform_vectors(0),
     max_varying_vectors(0),
@@ skipping 327 matching lines @@
     validators_.texture_internal_format.AddValue(GL_BGRA_EXT);
     validators_.texture_format.AddValue(GL_BGRA_EXT);
   }
 
   if (enable_read_format_bgra) {
     AddExtensionString("GL_EXT_read_format_bgra");
     validators_.read_pixel_format.AddValue(GL_BGRA_EXT);
   }
 
   if (enable_render_buffer_bgra) {
+    feature_flags_.ext_render_buffer_format_bgra8888 = true;

[vmiura, 2015/06/09 23:05:11]

Could you add a FeatureInfoTest for this?

     AddExtensionString("GL_CHROMIUM_renderbuffer_format_BGRA8888");
     validators_.render_buffer_format.AddValue(GL_BGRA8_EXT);
   }
 
   if (extensions.Contains("GL_OES_rgb8_rgba8") || gfx::HasDesktopGLFeatures()) {
     AddExtensionString("GL_OES_rgb8_rgba8");
     validators_.render_buffer_format.AddValue(GL_RGB8_OES);
     validators_.render_buffer_format.AddValue(GL_RGBA8_OES);
   }
 
@@ skipping 613 matching lines @@
   if (pos == std::string::npos) {
     extensions_ += (extensions_.empty() ? "" : " ") + str;
   }
 }
 
 FeatureInfo::~FeatureInfo() {
 }
 
 }  // namespace gles2
 }  // namespace gpu