Mac: Use GpuMemoryBuffers by default

content/public/common/content_switches.cc

Index: content/public/common/content_switches.cc
diff --git a/content/public/common/content_switches.cc b/content/public/common/content_switches.cc
index 44acc0913d4c2e60edeedb2ca31f0467b0a2e4f3..09d758d22a514f911920fd7c81d8d29e8d7c0037 100644
--- a/content/public/common/content_switches.cc
+++ b/content/public/common/content_switches.cc
@@ -122,6 +122,10 @@ const char kDisableGpuCompositing[]         = "disable-gpu-compositing";
 // Disable proactive early init of GPU process.
 const char kDisableGpuEarlyInit[]           = "disable-gpu-early-init";
 
+// Do not force that all compositor resources be backed by GPU memory buffers.
+const char kDisableGpuMemoryBufferCompositorResources[] =
+    "disable-gpu-memory-buffer-compositor-resources";
+
 // Disable GpuMemoryBuffer backed VideoFrames.
 const char kDisableGpuMemoryBufferVideoFrames[] =
     "disable-gpu-memory-buffer-video-frames";