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 0464ef6ad8ccab91397e1f97d5155b5a04c32104..b790cc61d04448c211ff936e6c71c7735aa86160 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;