Implement Wheel Gesture Scrolling on OSX.

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 <stddef.h>
 
 #include "base/command_line.h"
 #include "base/location.h"
@@ skipping 254 matching lines @@
     NavigateToURL(shell(), test_url);
 
     WebContentsImpl* web_contents =
         static_cast<WebContentsImpl*>(shell()->web_contents());
     NavigationControllerImpl* controller = &web_contents->GetController();
 
     screenshot_manager_ = new ScreenshotTracker(controller);
     controller->SetScreenshotManager(make_scoped_ptr(screenshot_manager_));
 
     frame_watcher_ = new FrameWatcher();
-    GetRenderWidgetHost()->GetProcess()->AddFilter(frame_watcher_.get());
+    frame_watcher_->AttachTo(shell()->web_contents());
   }
 
   void SetUpCommandLine(base::CommandLine* cmd) override {
     cmd->AppendSwitchASCII(switches::kTouchEvents,
                            switches::kTouchEventsEnabled);
   }
 
   void TestOverscrollNavigation(bool touch_handler) {
     ASSERT_NO_FATAL_FAILURE(StartTestWithPage("/overscroll_navigation.html"));
     WebContentsImpl* web_contents =
@@ skipping 840 matching lines @@
     details = dispatcher->OnEventFromSource(&release);
     ASSERT_FALSE(details.dispatcher_destroyed);
     WaitAFrame();
 
     EXPECT_LT(0, tracker.num_overscroll_updates());
     EXPECT_FALSE(tracker.overscroll_completed());
   }
 }
 
 }  // namespace content