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

gpu/command_buffer/tests/gl_unittest.cc

Index: gpu/command_buffer/tests/gl_unittest.cc
diff --git a/gpu/command_buffer/tests/gl_unittest.cc b/gpu/command_buffer/tests/gl_unittest.cc
index 49eb00256cd720aa66b0a4493d8280d38c467133..10851815e3abbbac93cd450d5677640004192f8b 100644
--- a/gpu/command_buffer/tests/gl_unittest.cc
+++ b/gpu/command_buffer/tests/gl_unittest.cc
@@ -106,6 +106,8 @@ TEST_F(GLTest, FeatureFlagsMatchCapabilities) {
   EXPECT_EQ(caps.blend_equation_advanced_coherent,
             flags.blend_equation_advanced_coherent);
   EXPECT_EQ(caps.texture_rg, flags.ext_texture_rg);
+  EXPECT_EQ(caps.render_buffer_format_bgra8888,
+            flags.ext_render_buffer_format_bgra8888);
 }
 
 TEST_F(GLTest, GetString) {