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

gpu/command_buffer/service/gles2_cmd_decoder.h

Index: gpu/command_buffer/service/gles2_cmd_decoder.h
diff --git a/gpu/command_buffer/service/gles2_cmd_decoder.h b/gpu/command_buffer/service/gles2_cmd_decoder.h
index 00fff767763729e27b4242bee360e9ba5fb3efd3..630ea4e82899ecf45290ee3141af44f399cf248e 100644
--- a/gpu/command_buffer/service/gles2_cmd_decoder.h
+++ b/gpu/command_buffer/service/gles2_cmd_decoder.h
@@ -106,6 +106,9 @@ class GLES2Decoder : public CommonDecoder {
   virtual void SetResizeCallback(
       Callback1<gfx::Size>::Type* callback) = 0;
 
+  virtual void SetSurfaceVisibleCallback(
+      Callback1<bool>::Type* callback) = 0;
+
 #if defined(OS_MACOSX)
   // Sets a callback which is called when a SwapBuffers command is processed.
   virtual void SetSwapBuffersCallback(Callback0::Type* callback) = 0;