[content shell] add support for running headless on mac

content/shell/renderer/webkit_test_runner.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/shell/renderer/webkit_test_runner.h"
 
 #include <algorithm>
 #include <clocale>
 #include <cmath>
 
@@ skipping 550 matching lines @@
 }
 
 void WebKitTestRunner::Navigate(const GURL& url) {
   focus_on_next_commit_ = true;
   if (!is_main_window_ &&
       ShellRenderProcessObserver::GetInstance()->main_test_runner() == this) {
     WebTestInterfaces* interfaces =
         ShellRenderProcessObserver::GetInstance()->test_interfaces();
     interfaces->setTestIsRunning(true);
     interfaces->configureForTestWithURL(GURL(), false);
+    ForceResizeRenderView(render_view(), WebSize(800, 600));
   }
 }
 
 void WebKitTestRunner::DidCommitProvisionalLoad(WebFrame* frame,
                                                 bool is_new_navigation) {
   if (!focus_on_next_commit_)
     return;
   focus_on_next_commit_ = false;
   render_view()->GetWebView()->setFocusedFrame(frame);
 }
@@ skipping 128 matching lines @@
       ->loadRequest(WebURLRequest(GURL("about:blank")));
   Send(new ShellViewHostMsg_ResetDone(routing_id()));
 }
 
 void WebKitTestRunner::OnNotifyDone() {
   render_view()->GetWebView()->mainFrame()->executeScript(
       WebScriptSource(WebString::fromUTF8("testRunner.notifyDone();")));
 }
 
 }  // namespace content