Replace WGC3D visibility extension with resource_usage extension. [Part 2 of 3]

content/renderer/gpu/webgraphicscontext3d_command_buffer_impl.cc

 // Copyright (c) 2012 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 "third_party/khronos/GLES2/gl2.h"
 #ifndef GL_GLEXT_PROTOTYPES
@@ skipping 433 matching lines @@
     WGC3Denum access) {
   return gl_->MapTexSubImage2DCHROMIUM(
       target, level, xoffset, yoffset, width, height, format, type, access);
 }
 
 void WebGraphicsContext3DCommandBufferImpl::unmapTexSubImage2DCHROMIUM(
     const void* mem) {
   gl_->UnmapTexSubImage2DCHROMIUM(mem);
 }
 
-void WebGraphicsContext3DCommandBufferImpl::setVisibilityCHROMIUM(
-    bool visible) {
+void WebGraphicsContext3DCommandBufferImpl::setResourceUsageCHROMIUM(
+    ResourceUsage resourceUsage) {
   gl_->Flush();
-  context_->SetSurfaceVisible(visible);
-  if (!visible)
-    gl_->FreeEverything();
+  switch (resourceUsage) {
+    case RESOURCE_USAGE_FULL:
+      context_->SetResourceUsage(gfx::GLSurface::RESOURCE_USAGE_FULL);
+      break;
+    case RESOURCE_USAGE_LESS:
+      context_->SetResourceUsage(gfx::GLSurface::RESOURCE_USAGE_LESS);
+      gl_->FreeEverything();
+      break;
+    case RESOURCE_USAGE_NONE:
+      context_->SetResourceUsage(gfx::GLSurface::RESOURCE_USAGE_NONE);
+      break;
+  }
 }
 
 void WebGraphicsContext3DCommandBufferImpl::copyTextureToParentTextureCHROMIUM(
     WebGLId texture, WebGLId parentTexture) {
   NOTIMPLEMENTED();
 }
 
 void WebGraphicsContext3DCommandBufferImpl::
     rateLimitOffscreenContextCHROMIUM() {
   gl_->RateLimitOffscreenContextCHROMIUM();
@@ skipping 734 matching lines @@
   }
   if (attributes_.shareResources)
     ClearSharedContexts();
   RenderViewImpl* renderview =
       web_view_ ? RenderViewImpl::FromWebView(web_view_) : NULL;
   if (renderview)
     renderview->OnViewContextSwapBuffersAborted();
 }
 
 #endif  // defined(ENABLE_GPU)