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 951bbd62406e49e96adfa62320ad201a7f37cd24..8defed5c4630dc427a85cf36fd444c32ddde1d6f 100644
--- a/gpu/command_buffer/service/gles2_cmd_decoder.cc
+++ b/gpu/command_buffer/service/gles2_cmd_decoder.cc
@@ -3087,6 +3087,8 @@ Capabilities GLES2DecoderImpl::GetCapabilities() {
   caps.blend_equation_advanced_coherent =
       feature_info_->feature_flags().blend_equation_advanced_coherent;
   caps.texture_rg = feature_info_->feature_flags().ext_texture_rg;
+  caps.render_buffer_format_bgra8888 =
+      feature_info_->feature_flags().ext_render_buffer_format_bgra8888;
   return caps;
 }