Make WebContentsObserver::DidGetUserInteraction fire on TouchStart instead of GestureTapBegin.

chrome/browser/engagement/site_engagement_helper.cc

 // 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 "chrome/browser/engagement/site_engagement_helper.h"
 
 #include <utility>
 
 #include "base/time/time.h"
 #include "base/trace_event/trace_event.h"
@@ skipping 82 matching lines @@
   // This switch has a default NOTREACHED case because it will not test all
   // of the values of the WebInputEvent::Type enum (hence it won't require the
   // compiler verifying that all cases are covered).
   switch (type) {
     case blink::WebInputEvent::RawKeyDown:
       helper()->RecordUserInput(SiteEngagementMetrics::ENGAGEMENT_KEYPRESS);
       break;
     case blink::WebInputEvent::MouseDown:
       helper()->RecordUserInput(SiteEngagementMetrics::ENGAGEMENT_MOUSE);
       break;
-    case blink::WebInputEvent::GestureTapDown:
+    case blink::WebInputEvent::TouchStart:
       helper()->RecordUserInput(
           SiteEngagementMetrics::ENGAGEMENT_TOUCH_GESTURE);
       break;
     case blink::WebInputEvent::GestureScrollBegin:
       helper()->RecordUserInput(SiteEngagementMetrics::ENGAGEMENT_SCROLL);
       break;
     case blink::WebInputEvent::Undefined:
       // Explicitly ignore browser-initiated navigation input.
       break;
     default:
@@ skipping 128 matching lines @@
 void SiteEngagementService::Helper::SetSecondsTrackingDelayAfterNavigation(
     int seconds) {
   g_seconds_delay_after_navigation = seconds;
 }
 
 // static
 void SiteEngagementService::Helper::SetSecondsTrackingDelayAfterShow(
     int seconds) {
   g_seconds_delay_after_show = seconds;
 }