content: Add command line flag for native GPU memory buffers.

content/browser/gpu/browser_gpu_channel_host_factory.h

Index: content/browser/gpu/browser_gpu_channel_host_factory.h
diff --git a/content/browser/gpu/browser_gpu_channel_host_factory.h b/content/browser/gpu/browser_gpu_channel_host_factory.h
index 76e77f89817f53aaa8652ef010b5c5027b786cdd..84ad1ff19284bc253ba1befe24ad1a1639b04385 100644
--- a/content/browser/gpu/browser_gpu_channel_host_factory.h
+++ b/content/browser/gpu/browser_gpu_channel_host_factory.h
@@ -25,6 +25,11 @@ class CONTENT_EXPORT BrowserGpuChannelHostFactory
   static void Terminate();
   static BrowserGpuChannelHostFactory* instance() { return instance_; }
 
+  static void EnableGpuMemoryBufferFactoryUsage(
+      gfx::GpuMemoryBuffer::Usage usage);
+  static bool IsGpuMemoryBufferFactoryUsageEnabled(
+      gfx::GpuMemoryBuffer::Usage usage);
+
   // Overridden from GpuChannelHostFactory:
   bool IsMainThread() override;
   base::MessageLoop* GetMainLoop() override;