Command to mark surface inactive, so gpu process can release resources.

content/renderer/gpu/renderer_gl_context.h

Index: content/renderer/gpu/renderer_gl_context.h
diff --git a/content/renderer/gpu/renderer_gl_context.h b/content/renderer/gpu/renderer_gl_context.h
index a138b549128f0e5ab29ded2268992fc83d6362f2..16834cbebdb077090121adeea0f459892b6c4afe 100644
--- a/content/renderer/gpu/renderer_gl_context.h
+++ b/content/renderer/gpu/renderer_gl_context.h
@@ -160,6 +160,9 @@ class RendererGLContext : public base::SupportsWeakPtr<RendererGLContext>,
   // task whether the echo succeeds or not.
   bool Echo(const base::Closure& task);
 
+  // Sends an IPC message with the new state of surface visibility
+  bool SetSurfaceVisible(bool visibility);
+
   // Create a TransportTextureHost object associated with the context.
   scoped_refptr<TransportTextureHost> CreateTransportTextureHost();