Add abstractions that let embedders drive tests of WebContents.

chrome/browser/automation/automation_provider.h

 // 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.
 
 // This implements a browser-side endpoint for UI automation activity.
 // The client-side endpoint is implemented by AutomationProxy.
 // The entire lifetime of this object should be contained within that of
 // the BrowserProcess, and in particular the NotificationService that's
 // hung off of it.
 
@@ skipping 35 matching lines @@
 class Browser;
 class Extension;
 class ExtensionTestResultNotificationObserver;
 class ExternalTabContainer;
 class FilePath;
 class InitialLoadObserver;
 class LoginHandler;
 class MetricEventDurationObserver;
 class NavigationControllerRestoredObserver;
 class Profile;
-class TabContents;
 struct AutomationMsg_Find_Params;
 struct Reposition_Params;
 struct ExternalTabSettings;
 
 namespace IPC {
 class ChannelProxy;
 }
 
 namespace content {
 class NavigationController;
@@ skipping 363 matching lines @@
   std::string channel_id_;
 
   // Trace data that has been collected but not flushed to the automation
   // client.
   TracingData tracing_data_;
 
   DISALLOW_COPY_AND_ASSIGN(AutomationProvider);
 };
 
 #endif  // CHROME_BROWSER_AUTOMATION_AUTOMATION_PROVIDER_H_