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

gpu/command_buffer/service/gles2_cmd_decoder.cc

Index: gpu/command_buffer/service/gles2_cmd_decoder.cc
diff --git a/gpu/command_buffer/service/gles2_cmd_decoder.cc b/gpu/command_buffer/service/gles2_cmd_decoder.cc
index 6806f126eecfad57034b913e38a67c25c3fdfdf5..caf752e438c248a20970a11d53e92ec00eb27d44 100644
--- a/gpu/command_buffer/service/gles2_cmd_decoder.cc
+++ b/gpu/command_buffer/service/gles2_cmd_decoder.cc
@@ -3148,6 +3148,8 @@ Capabilities GLES2DecoderImpl::GetCapabilities() {
   caps.texture_rg = feature_info_->feature_flags().ext_texture_rg;
   caps.max_copy_texture_chromium_size =
       feature_info_->workarounds().max_copy_texture_chromium_size;
+  caps.render_buffer_format_bgra8888 =
+      feature_info_->feature_flags().ext_render_buffer_format_bgra8888;
   return caps;
 }