overscroll: Fix an issue where the overscroll window could get stuck.

content/browser/web_contents/web_contents_view_aura_browsertest.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.
 
 #include "content/browser/web_contents/web_contents_view_aura.h"
 
 #include "base/command_line.h"
 #include "base/run_loop.h"
 #include "base/test/test_timeouts.h"
 #include "base/utf_string_conversions.h"
@@ skipping 78 matching lines @@
   }
 
   void TestOverscrollNavigation(bool touch_handler) {
     ASSERT_NO_FATAL_FAILURE(
         StartTestWithPage("files/overscroll_navigation.html"));
     WebContentsImpl* web_contents =
         static_cast<WebContentsImpl*>(shell()->web_contents());
     NavigationController& controller = web_contents->GetController();
     RenderViewHostImpl* view_host = static_cast<RenderViewHostImpl*>(
         web_contents->GetRenderViewHost());
+    WebContentsViewAura* view_aura = static_cast<WebContentsViewAura*>(
+        web_contents->GetView());
+    view_aura->SetupOverlayWindowForTesting();
 
     EXPECT_FALSE(controller.CanGoBack());
     EXPECT_FALSE(controller.CanGoForward());
     int index = -1;
     scoped_ptr<base::Value> value =
         content::ExecuteScriptAndGetValue(view_host, "get_current()");
     ASSERT_TRUE(value->GetAsInteger(&index));
     EXPECT_EQ(0, index);
 
     if (touch_handler)
@@ skipping 299 matching lines @@
         web_contents->GetController().GetEntryAtOffset(-1));
     EXPECT_TRUE(entry->screenshot().get());
 
     entry = NavigationEntryImpl::FromNavigationEntry(
         web_contents->GetController().GetActiveEntry());
     EXPECT_FALSE(entry->screenshot().get());
   }
 }
 
 }  // namespace content