Enable smooth scrolling on mac

content/browser/renderer_host/browser_render_process_host.cc

 // Copyright (c) 2011 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.
 
 // Represents the browser side of the browser <--> renderer communication
 // channel. There will be one RenderProcessHost per renderer process.
 
 #include "content/browser/renderer_host/browser_render_process_host.h"
 
 #include <algorithm>
@@ skipping 549 matching lines @@
     switches::kEnableDCHECK,
     switches::kEnableGPUServiceLogging,
     switches::kEnableGPUClientLogging,
     switches::kEnableLogging,
     switches::kEnableMediaStream,
     switches::kEnableFullScreen,
     switches::kEnablePepperTesting,
 #if defined(OS_MACOSX)
     // Allow this to be set when invoking the browser and relayed along.
     switches::kEnableSandboxLogging,
+    switches::kDisableMacSmoothScrollingForTesting,
 #endif
     switches::kEnableSeccompSandbox,
     switches::kEnableStatsTable,
     switches::kEnableVideoFullscreen,
     switches::kEnableVideoLogging,
     switches::kFullMemoryCrashReport,
 #if !defined (GOOGLE_CHROME_BUILD)
     // These are unsupported and not fully tested modes, so don't enable them
     // for official Google Chrome builds.
     switches::kInProcessPlugins,
@@ skipping 350 matching lines @@
 void BrowserRenderProcessHost::OnRevealFolderInOS(const FilePath& path) {
   // Only honor the request if appropriate persmissions are granted.
   if (ChildProcessSecurityPolicy::GetInstance()->CanReadFile(id(), path))
     content::GetContentClient()->browser()->OpenItem(path);
 }
 
 void BrowserRenderProcessHost::OnSavedPageAsMHTML(int job_id, bool success) {
   content::GetContentClient()->browser()->GetMHTMLGenerationManager()->
       MHTMLGenerated(job_id, success);
 }