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

content/common/gpu/image_transport_surface_mac.cc

Index: content/common/gpu/image_transport_surface_mac.cc
diff --git a/content/common/gpu/image_transport_surface_mac.cc b/content/common/gpu/image_transport_surface_mac.cc
index 44e72e094d3d18c6974504f5c024e0bba3440dae..b40697b8ce73822db19f8032f374669cad681767 100644
--- a/content/common/gpu/image_transport_surface_mac.cc
+++ b/content/common/gpu/image_transport_surface_mac.cc
@@ -44,6 +44,7 @@ class IOSurfaceImageTransportSurface : public gfx::PbufferGLSurfaceCGL,
                                TransportDIB::Handle shm_handle) OVERRIDE;
   virtual void OnBuffersSwappedACK() OVERRIDE;
   virtual void OnResize(gfx::Size size) OVERRIDE;
+  virtual void OnSurfaceVisible(bool visible) OVERRIDE;
 
  private:
   virtual ~IOSurfaceImageTransportSurface() OVERRIDE;
@@ -92,6 +93,7 @@ class TransportDIBImageTransportSurface : public gfx::PbufferGLSurfaceCGL,
   virtual void OnNewSurfaceACK(uint64 surface_id,
                                TransportDIB::Handle shm_handle) OVERRIDE;
   virtual void OnResize(gfx::Size size) OVERRIDE;
+  virtual void OnSurfaceVisible(bool visible) OVERRIDE;
 
  private:
   virtual ~TransportDIBImageTransportSurface() OVERRIDE;
@@ -306,6 +308,9 @@ void IOSurfaceImageTransportSurface::OnResize(gfx::Size size) {
   helper_->SetScheduled(false);
 }
 
+void IOSurfaceImageTransportSurface::OnSurfaceVisible(bool visible) {
+}
+
 TransportDIBImageTransportSurface::TransportDIBImageTransportSurface(
     GpuChannelManager* manager,
     int32 render_view_id,
@@ -435,6 +440,9 @@ void TransportDIBImageTransportSurface::OnResize(gfx::Size size) {
   helper_->SetScheduled(false);
 }
 
+void TransportDIBImageTransportSurface::OnSurfaceVisible(bool visible) {
+}
+
 }  // namespace
 
 // static