Touch event flag should control only DOM event firing.

third_party/WebKit/Source/web/DevToolsEmulator.cpp

 // Copyright 2015 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 "web/DevToolsEmulator.h"
 
 #include "core/frame/FrameHost.h"
 #include "core/frame/FrameView.h"
 #include "core/frame/Settings.h"
 #include "core/frame/VisualViewport.h"
@@ skipping 428 matching lines @@
   viewportSize.scale(1. / m_viewportOverride->scale);
   return enclosingIntRect(
       FloatRect(m_viewportOverride->position.x, m_viewportOverride->position.y,
                 viewportSize.width(), viewportSize.height()));
 }
 
 void DevToolsEmulator::setTouchEventEmulationEnabled(bool enabled) {
   if (m_touchEventEmulationEnabled == enabled)
     return;
   if (!m_touchEventEmulationEnabled) {
-    m_originalTouchEnabled = RuntimeEnabledFeatures::touchEnabled();
+    m_originalTouchEnabled = RuntimeEnabledFeatures::touchEventAPIEnabled();

[mustaq, 2016/11/16 14:54:16]

Please rename DevToolsEmulator::m_originalTouchEnabled to
m_originalTouchEventAPIEnabled.

[sunyunjia, 2016/11/16 16:39:58]

Done.

     m_originalDeviceSupportsMouse =
         m_webViewImpl->page()->settings().deviceSupportsMouse();
     m_originalDeviceSupportsTouch =
         m_webViewImpl->page()->settings().deviceSupportsTouch();
     m_originalMaxTouchPoints =
         m_webViewImpl->page()->settings().maxTouchPoints();
   }
-  RuntimeEnabledFeatures::setTouchEnabled(enabled ? true
-                                                  : m_originalTouchEnabled);
+  RuntimeEnabledFeatures::setTouchEventAPIEnabled(
+      enabled ? true : m_originalTouchEnabled);
   if (!m_originalDeviceSupportsTouch) {
     m_webViewImpl->page()->settings().setDeviceSupportsMouse(
         enabled ? false : m_originalDeviceSupportsMouse);
     m_webViewImpl->page()->settings().setDeviceSupportsTouch(
         enabled ? true : m_originalDeviceSupportsTouch);
     // Currently emulation does not provide multiple touch points.
     m_webViewImpl->page()->settings().setMaxTouchPoints(
         enabled ? 1 : m_originalMaxTouchPoints);
   }
   m_touchEventEmulationEnabled = enabled;
@@ skipping 48 matching lines @@
       m_lastPinchAnchorCss.reset();
       m_lastPinchAnchorDip.reset();
     }
     return true;
   }
 
   return false;
 }
 
 }  // namespace blink