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 33891606bbf1c5bb0d10d933fbb781e4be2dcc8c..04f7fa6d2da157ac537c210aa5d01e2b5441c68b 100644
--- a/content/common/gpu/image_transport_surface_linux.cc
+++ b/content/common/gpu/image_transport_surface_linux.cc
@@ -56,6 +56,7 @@ 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 OnSurfaceVisible(bool visible) OVERRIDE;
 
  private:
   virtual ~EGLImageTransportSurface() OVERRIDE;
@@ -94,6 +95,7 @@ class GLXImageTransportSurface : public ImageTransportSurface,
       uint64 surface_id, TransportDIB::Handle surface_handle) OVERRIDE;
   virtual void OnBuffersSwappedACK() OVERRIDE;
   virtual void OnResize(gfx::Size size) OVERRIDE;
+  virtual void OnSurfaceVisible(bool visible) OVERRIDE;
 
  private:
   virtual ~GLXImageTransportSurface();
@@ -140,6 +142,7 @@ class OSMesaImageTransportSurface : public ImageTransportSurface,
       uint64 surface_id, TransportDIB::Handle surface_handle) OVERRIDE;
   virtual void OnBuffersSwappedACK() OVERRIDE;
   virtual void OnResize(gfx::Size size) OVERRIDE;
+  virtual void OnSurfaceVisible(bool visible) OVERRIDE;
 
  private:
   virtual ~OSMesaImageTransportSurface();
@@ -246,6 +249,15 @@ void EGLImageTransportSurface::OnResize(gfx::Size size) {
   helper_->SetScheduled(false);
 }
 
+void EGLImageTransportSurface::OnSurfaceVisible(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<AcceleratedSurface*>(NULL));
@@ -389,6 +401,9 @@ void GLXImageTransportSurface::OnResize(gfx::Size size) {
   helper_->SetScheduled(false);
 }
 
+void GLXImageTransportSurface::OnSurfaceVisible(bool visible) {
+}
+
 bool GLXImageTransportSurface::SwapBuffers() {
   gfx::NativeViewGLSurfaceGLX::SwapBuffers();
   glFlush();
@@ -493,6 +508,9 @@ void OSMesaImageTransportSurface::OnResize(gfx::Size size) {
   helper_->SetScheduled(false);
 }
 
+void OSMesaImageTransportSurface::OnSurfaceVisible(bool visible) {
+}
+
 void OSMesaImageTransportSurface::OnNewSurfaceACK(
     uint64 surface_id, TransportDIB::Handle surface_handle) {
   shared_id_ = surface_id;