add flag to disable link disambiguation popup

content/renderer/render_view_impl.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/renderer/render_view_impl.h"
 
 #include <algorithm>
 #include <cmath>
 
 #include "base/auto_reset.h"
@@ skipping 4033 matching lines @@
   if (!main_frame)
     return;
   main_frame->enableViewSourceMode(true);
 }
 
 #if defined(OS_ANDROID) || defined(TOOLKIT_VIEWS)
 bool RenderViewImpl::didTapMultipleTargets(
     const WebSize& inner_viewport_offset,
     const WebRect& touch_rect,
     const WebVector<WebRect>& target_rects) {
+  if (!switches::IsLinkDisambiguationPopupEnabled())

[jdduke (slow), 2014/11/23 20:01:00]

Could we either cache this switch or push it to Blink? 

+    return false;
+
   // Never show a disambiguation popup when accessibility is enabled,
   // as this interferes with "touch exploration".
   AccessibilityMode accessibility_mode =
       GetMainRenderFrame()->accessibility_mode();
   bool matches_accessibility_mode_complete =
       (accessibility_mode & AccessibilityModeComplete) ==
           AccessibilityModeComplete;
   if (matches_accessibility_mode_complete)
     return false;
 
@@ skipping 162 matching lines @@
     std::vector<gfx::Size> sizes;
     ConvertToFaviconSizes(icon_urls[i].sizes(), &sizes);
     if (!url.isEmpty())
       urls.push_back(
           FaviconURL(url, ToFaviconType(icon_urls[i].iconType()), sizes));
   }
   SendUpdateFaviconURL(urls);
 }
 
 }  // namespace content