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

content/common/gpu/image_transport_surface_linux.cc

Index: content/common/gpu/image_transport_surface_linux.cc
diff --git a/content/common/gpu/image_transport_surface_linux.cc b/content/common/gpu/image_transport_surface_linux.cc
index 079294f2bcdcc833edb527e8a9d3e92dd1985673..c9419dcbeb0fc0d817eb7d36e0de808cc6796515 100644
--- a/content/common/gpu/image_transport_surface_linux.cc
+++ b/content/common/gpu/image_transport_surface_linux.cc
@@ -76,6 +76,7 @@ class EGLImageTransportSurface : public ImageTransportSurface,
       uint64 surface_id, TransportDIB::Handle surface_handle) OVERRIDE;
   virtual void OnBuffersSwappedACK() OVERRIDE;
   virtual void OnResize(gfx::Size size) OVERRIDE;
+  virtual void OnSetSurfaceVisible(bool visible) OVERRIDE;
 
  private:
   virtual ~EGLImageTransportSurface() OVERRIDE;
@@ -308,6 +309,15 @@ void EGLImageTransportSurface::OnResize(gfx::Size size) {
   helper_->SetScheduled(false);
 }
 
+void EGLImageTransportSurface::OnSetSurfaceVisible(bool visible) {
+  if (!visible && back_surface_.get() && front_surface_.get()) {
+    ReleaseSurface(&back_surface_);
+  } else if (visible && !back_surface_.get() && front_surface_.get()) {
+    // Leverage the OnResize hook because it does exactly what we want
+    OnResize(front_surface_->size());
+  }
+}
+
 bool EGLImageTransportSurface::SwapBuffers() {
   front_surface_.swap(back_surface_);
   DCHECK_NE(front_surface_.get(), static_cast<EGLAcceleratedSurface*>(NULL));