Add abstractions that let embedders drive tests of WebContents.

chrome/test/base/chrome_render_view_host_test_harness.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 "chrome/test/base/chrome_render_view_host_test_harness.h"
 
 #include "chrome/test/base/testing_profile.h"
 
 #if defined(USE_AURA)
 #include "ash/shell.h"
 #include "ui/aura/env.h"
 #include "ui/aura/root_window.h"
 #endif
 
 using content::RenderViewHostTester;
 
 ChromeRenderViewHostTestHarness::ChromeRenderViewHostTestHarness()
     : RenderViewHostTestHarness() {
 }
 
 ChromeRenderViewHostTestHarness::~ChromeRenderViewHostTestHarness() {
 }
 
 TestingProfile* ChromeRenderViewHostTestHarness::profile() {
   return static_cast<TestingProfile*>(browser_context_.get());
 }
 
+content::WebContents* ChromeRenderViewHostTestHarness::contents() {
+  return web_contents();
+}
+
 RenderViewHostTester* ChromeRenderViewHostTestHarness::rvh_tester() {
   return RenderViewHostTester::For(rvh());
 }
 
 void ChromeRenderViewHostTestHarness::SetUp() {
   if (!browser_context_.get())
     browser_context_.reset(new TestingProfile());
   RenderViewHostTestHarness::SetUp();
 }
 
 void ChromeRenderViewHostTestHarness::TearDown() {
   RenderViewHostTestHarness::TearDown();
 #if defined(USE_AURA)
   ash::Shell::DeleteInstance();
   aura::Env::DeleteInstance();
 #endif
 }