D3D11: Disable the RGB10A2 backbuffer format.

src/libANGLE/renderer/d3d/d3d11/Renderer11.cpp

@@ -938,7 +938,10 @@ egl::ConfigSet Renderer11::generateConfigs()
         // Additional high bit depth formats added in D3D 10.0
         // https://msdn.microsoft.com/en-us/library/windows/desktop/bb173064.aspx
         colorBufferFormats.push_back(GL_RGBA16F);
-        colorBufferFormats.push_back(GL_RGB10_A2);
+
+        // TODO(geofflang): Re-enable once client code has been updated to filter configs better and
+        // not use RGB10A2 accidentally when requesting RGBA8
+        // colorBufferFormats.push_back(GL_RGB10_A2);
     }
 
     if (!mPresentPathFastEnabled)