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

content/common/gpu/image_transport_surface_linux.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #if defined(ENABLE_GPU)
 
 #include "content/common/gpu/image_transport_surface.h"
 
 // This conflicts with the defines in Xlib.h and must come first.
 #include "content/common/gpu/gpu_messages.h"
@@ skipping 58 matching lines @@
   virtual gfx::Size GetSize() OVERRIDE;
   virtual void OnMakeCurrent(gfx::GLContext* context) OVERRIDE;
   virtual unsigned int GetBackingFrameBufferObject() OVERRIDE;
 
  protected:
   // ImageTransportSurface implementation
   virtual void OnNewSurfaceACK(
       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;
   void ReleaseSurface(scoped_refptr<EGLAcceleratedSurface>* surface);
 
   uint32 fbo_id_;
 
   scoped_refptr<EGLAcceleratedSurface> back_surface_;
   scoped_refptr<EGLAcceleratedSurface> front_surface_;
 
@@ skipping 212 matching lines @@
 
   GpuHostMsg_AcceleratedSurfaceNew_Params params;
   params.width = size.width();
   params.height = size.height();
   params.surface_id = back_surface_->pixmap();
   helper_->SendAcceleratedSurfaceNew(params);
 
   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));
   glFlush();
 
   GpuHostMsg_AcceleratedSurfaceBuffersSwapped_Params params;
   params.surface_id = front_surface_->pixmap();
   helper_->SendAcceleratedSurfaceBuffersSwapped(params);
 
   gfx::Size expected_size = front_surface_->size();
@@ skipping 298 matching lines @@
       NOTREACHED();
       return NULL;
   }
   if (surface->Initialize())
     return surface;
   else
     return NULL;
 }
 
 #endif  // defined(USE_GPU)