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

content/renderer/gpu/webgraphicscontext3d_command_buffer_impl.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/renderer/gpu/webgraphicscontext3d_command_buffer_impl.h"
 
 #include "gpu/GLES2/gl2.h"
 #ifndef GL_GLEXT_PROTOTYPES
@@ skipping 254 matching lines @@
   cached_width_ = width;
   cached_height_ = height;
 
   gl_->ResizeCHROMIUM(width, height);
 
 #ifdef FLIP_FRAMEBUFFER_VERTICALLY
   scanline_.reset(new uint8[width * 4]);
 #endif  // FLIP_FRAMEBUFFER_VERTICALLY
 }
 
+void WebGraphicsContext3DCommandBufferImpl::setVisibility(bool visible) {
+  gl_->SetSurfaceVisibleCHROMIUM(visible);
+  if (!visible)
+    gl_->helper()->CommandBufferHelper::Flush();
+}
+
 #ifdef FLIP_FRAMEBUFFER_VERTICALLY
 void WebGraphicsContext3DCommandBufferImpl::FlipVertically(
     uint8* framebuffer,
     unsigned int width,
     unsigned int height) {
   uint8* scanline = scanline_.get();
   if (!scanline)
     return;
   unsigned int row_bytes = width * 4;
   unsigned int count = height / 2;
@@ skipping 805 matching lines @@
   }
 #ifndef WTF_USE_THREADED_COMPOSITING
   RenderView* renderview =
       web_view_ ? RenderView::FromWebView(web_view_) : NULL;
   if (renderview)
     renderview->OnViewContextSwapBuffersAborted();
 #endif
 }
 
 #endif  // defined(ENABLE_GPU)