Enable gesture events handling on Android.

content/public/android/java/src/org/chromium/content/browser/ZoomManager.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.util.Log;
 import android.view.Gravity;
 import android.view.MotionEvent;
@@ skipping 37 matching lines @@
         }
 
         void setTemporarilyIgnoreDetectorEvents(boolean value) {
             mTemporarilyIgnoreDetectorEvents = value;
         }
 
         @Override
         public boolean onScaleBegin(ScaleGestureDetector detector) {
             if (ignoreDetectorEvents()) return false;
             mPinchEventSent = false;
-            mContentViewCore.setIgnoreSingleTap(true);
+            mContentViewCore.getContentViewGestureHandler().setIgnoreSingleTap(true);
             return true;
         }
 
         @Override
         public void onScaleEnd(ScaleGestureDetector detector) {
             if (!mPinchEventSent || !mContentViewCore.isAlive()) return;
-            mContentViewCore.pinchEnd(detector.getEventTime());
+            mContentViewCore.getContentViewGestureHandler().pinchEnd(detector.getEventTime());
             mPinchEventSent = false;
         }
 
         @Override
         public boolean onScale(ScaleGestureDetector detector) {
             if (ignoreDetectorEvents()) return false;
             // It is possible that pinchBegin() was never called when we reach here.
             // This happens when webkit handles the 2nd touch down event. That causes
             // ContentView to ignore the onScaleBegin() call. And if webkit does not
             // handle the touch move events afterwards, we will face a situation
             // that pinchBy() is called without any pinchBegin().
             // To solve this problem, we call pinchBegin() here if it is never called.
             if (!mPinchEventSent) {
-                mContentViewCore.pinchBegin(detector.getEventTime(),
+                mContentViewCore.getContentViewGestureHandler().pinchBegin(detector.getEventTime(),
                         (int) detector.getFocusX(), (int) detector.getFocusY());
                 mPinchEventSent = true;
             }
-            mContentViewCore.pinchBy(
+            mContentViewCore.getContentViewGestureHandler().pinchBy(
                     detector.getEventTime(), (int) detector.getFocusX(), (int) detector.getFocusY(),
                     detector.getScaleFactor());
             return true;
         }
 
         private boolean ignoreDetectorEvents() {
             return mPermanentlyIgnoreDetectorEvents ||
                     mTemporarilyIgnoreDetectorEvents ||
                     !mContentViewCore.isAlive();
         }
@@ skipping 109 matching lines @@
             if (zoomIn) {
                 mContentViewCore.zoomIn();
             } else {
                 mContentViewCore.zoomOut();
             }
             // ContentView will call updateZoomControls after its current page scale
             // is got updated from the native code.
         }
     }
 }