Use MojoCompositorFrameSink in RendererCompositorFrameSink

cc/base/switches.cc

Index: cc/base/switches.cc
diff --git a/cc/base/switches.cc b/cc/base/switches.cc
index fca84ca3284ee431e2d5019e05a5fc3f001e6e46..a9e5105c94ef0c34db58f6cc0de0083d42f34058 100644
--- a/cc/base/switches.cc
+++ b/cc/base/switches.cc
@@ -55,6 +55,10 @@ const char kEnableGpuBenchmarking[] = "enable-gpu-benchmarking";
 // the parent compositor.
 const char kEnableSurfaceSynchronization[] = "enable-surface-synchronization";
 
+// Use MojoCompositorFrameSink for submitting CompositorFrames from renderer to
+// browser.
+const char kUseMojoCompositorFrameSink[] = "use-mojo-compositor-frame-sink";
+
 // Renders a border around compositor layers to help debug and study
 // layer compositing.
 const char kShowCompositedLayerBorders[] = "show-composited-layer-borders";