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

webkit/gpu/webgraphicscontext3d_in_process_impl.h

Index: webkit/gpu/webgraphicscontext3d_in_process_impl.h
diff --git a/webkit/gpu/webgraphicscontext3d_in_process_impl.h b/webkit/gpu/webgraphicscontext3d_in_process_impl.h
index 1bc447fa205648e78c1af6faa8383a85fa21e95f..86cbcc694e551d6cacacffe24bb742dd9b9b4dd2 100644
--- a/webkit/gpu/webgraphicscontext3d_in_process_impl.h
+++ b/webkit/gpu/webgraphicscontext3d_in_process_impl.h
@@ -72,6 +72,8 @@ class WebGraphicsContext3DInProcessImpl : public WebGraphicsContext3D {
 
   virtual void reshape(int width, int height);
 
+  virtual void setVisibility(bool visible);
+
   virtual bool readBackFramebuffer(unsigned char* pixels, size_t bufferSize);
   virtual bool readBackFramebuffer(unsigned char* pixels, size_t buffer_size,
                                    WebGLId framebuffer, int width, int height);