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

content/common/gpu/image_transport_surface.cc

Index: content/common/gpu/image_transport_surface.cc
diff --git a/content/common/gpu/image_transport_surface.cc b/content/common/gpu/image_transport_surface.cc
index 8d4c0763318d8048e0f58326abf37db3859b25c8..8e0be564a6a6c1ae98fb1799377205162a179d6e 100644
--- a/content/common/gpu/image_transport_surface.cc
+++ b/content/common/gpu/image_transport_surface.cc
@@ -42,6 +42,9 @@ bool ImageTransportHelper::Initialize() {
   decoder->SetResizeCallback(
        NewCallback(this, &ImageTransportHelper::Resize));
 
+  decoder->SetSurfaceVisibleCallback(
+       NewCallback(this, &ImageTransportHelper::SurfaceVisible));
+
   return true;
 }
 
@@ -112,6 +115,10 @@ void ImageTransportHelper::Resize(gfx::Size size) {
   surface_->OnResize(size);
 }
 
+void ImageTransportHelper::SurfaceVisible(bool visible) {
+  surface_->OnSurfaceVisible(visible);
+}
+
 bool ImageTransportHelper::MakeCurrent() {
   gpu::gles2::GLES2Decoder* decoder = Decoder();
   if (!decoder)