gpu: reference target surfaces through a globally unique surface id.

chrome/browser/tab_contents/thumbnail_generator_unittest.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.
 
 #include "base/basictypes.h"
 #include "base/stringprintf.h"
 #include "chrome/browser/history/top_sites.h"
 #include "chrome/browser/tab_contents/thumbnail_generator.h"
 #include "chrome/common/render_messages.h"
 #include "chrome/test/base/testing_profile.h"
@@ skipping 42 matching lines @@
  private:
   RenderWidgetHost* rwh_;
   DISALLOW_COPY_AND_ASSIGN(TestRenderWidgetHostViewWithBackingStoreSkia);
 };
 
 class ThumbnailGeneratorTest : public testing::Test {
  public:
   ThumbnailGeneratorTest() {
     profile_.reset(new TestingProfile());
     process_ = new MockRenderProcessHost(profile_.get());
-    widget_.reset(new RenderWidgetHost(process_, 1));
+    widget_.reset(new RenderWidgetHost(process_, MSG_ROUTING_NONE));
     view_.reset(new TestRenderWidgetHostViewWithBackingStoreSkia(
         widget_.get()));
     // Paiting will be skipped if there's no view.
     widget_->SetView(view_.get());
 
     // Need to send out a create notification for the RWH to get hooked. This is
     // a little scary in that we don't have a RenderView, but the only listener
     // will want a RenderWidget, so it works out OK.
     content::NotificationService::current()->Notify(
         content::NOTIFICATION_RENDER_VIEW_HOST_CREATED_FOR_TAB,
@@ skipping 324 matching lines @@
   good_score.good_clipping = true;
   good_score.boring_score = 0.0;
   good_score.load_completed = true;
   top_sites->AddKnownURL(kGoodURL, good_score);
 
   // Should be false, as the existing thumbnail is good enough (i.e. don't
   // need to replace the existing thumbnail which is new and good).
   EXPECT_FALSE(ThumbnailGenerator::ShouldUpdateThumbnail(
       &profile, top_sites.get(), kGoodURL));
 }