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 51 matching lines @@
                            int32 command_buffer_id);
 
   // GLSurface implementation
   virtual bool Initialize() OVERRIDE;
   virtual void Destroy() OVERRIDE;
   virtual bool IsOffscreen() OVERRIDE;
   virtual bool SwapBuffers() OVERRIDE;
   virtual gfx::Size GetSize() OVERRIDE;
   virtual void OnMakeCurrent(gfx::GLContext* context) OVERRIDE;
   virtual unsigned int GetBackingFrameBufferObject() OVERRIDE;
+  virtual void SetVisible(bool visible) 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;
 
  private:
   virtual ~EGLImageTransportSurface() OVERRIDE;
@@ skipping 181 matching lines @@
   GLenum status = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER);
   if (status != GL_FRAMEBUFFER_COMPLETE) {
     LOG(ERROR) << "Framebuffer incomplete.";
   }
 }
 
 unsigned int EGLImageTransportSurface::GetBackingFrameBufferObject() {
   return fbo_id_;
 }
 
+void EGLImageTransportSurface::SetVisible(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());
+  }
+}
+
 void EGLImageTransportSurface::ReleaseSurface(
     scoped_refptr<EGLAcceleratedSurface>* surface) {
   if (surface->get()) {
     GpuHostMsg_AcceleratedSurfaceRelease_Params params;
     params.identifier = (*surface)->pixmap();
     helper_->SendAcceleratedSurfaceRelease(params);
     *surface = NULL;
   }
 }
 
@@ skipping 336 matching lines @@
       NOTREACHED();
       return NULL;
   }
   if (surface->Initialize())
     return surface;
   else
     return NULL;
 }
 
 #endif  // defined(USE_GPU)