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

gpu/command_buffer/service/feature_info.cc

Index: gpu/command_buffer/service/feature_info.cc
diff --git a/gpu/command_buffer/service/feature_info.cc b/gpu/command_buffer/service/feature_info.cc
index c86de231fd4695af0574699fbab0570a12d47675..959932dd40b38363cbc04128fc4d2ba30aa95aef 100644
--- a/gpu/command_buffer/service/feature_info.cc
+++ b/gpu/command_buffer/service/feature_info.cc
@@ -164,7 +164,8 @@ FeatureInfo::FeatureFlags::FeatureFlags()
       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() :
@@ -512,6 +513,7 @@ void FeatureInfo::InitializeFeatures() {
   }
 
   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);
   }