Disable double tap zoom on mobile sites, to remove 300ms click delay

content/public/android/javatests/src/org/chromium/content/browser/ContentViewGestureHandlerTest.java

 // 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.
 
 package org.chromium.content.browser;
 
 import android.content.Context;
 import android.os.Build;
 import android.os.Bundle;
 import android.os.SystemClock;
@@ skipping 98 matching lines @@
         @Override
         public boolean didUIStealScroll(float x, float y) {
             // Not implemented.
             return false;
         }
 
         @Override
         public void invokeZoomPicker() {
             // Not implemented.
         }
-
-        @Override
-        public boolean hasFixedPageScale() {
-            return false;
-        }
     }
 
     static class MockZoomManager extends ZoomManager {
         MockZoomManager(Context context, ContentViewCore contentViewCore) {
             super(context, contentViewCore);
         }
 
         @Override
         public boolean processTouchEvent(MotionEvent event) {
             return false;
@@ skipping 666 matching lines @@
         public boolean didUIStealScroll(float x, float y) {
             // Not implemented.
             return false;
         }
 
         @Override
         public void invokeZoomPicker() {
             // Not implemented.
         }
 
-        @Override
-        public boolean hasFixedPageScale() {
-            return false;
-        }
-
         public GestureEvent getMostRecentGestureEvent() {
             return mMostRecentGestureEvent;
         }
 
         public boolean mostRecentGestureEventForLastForVSync() {
             return mMostRecentGestureEventWasLastForVSync;
         }
     }
 
     /**
@@ skipping 395 matching lines @@
         event = motionEvent(MotionEvent.ACTION_UP, downTime, eventTime + 10);
         assertFalse(mGestureHandler.onTouchEvent(event));
         assertEquals("A GESTURE_SINGLE_TAP_UNCONFIRMED gesture should have been sent",
                 ContentViewGestureHandler.GESTURE_SINGLE_TAP_UNCONFIRMED,
                         mockDelegate.mMostRecentGestureEvent.mType);
 
         assertTrue("Should not have confirmed a single tap yet",
                 mMockListener.mLastSingleTap == null);
     }
 }