[Android] Add mechanism to disable double tap/drag zooming.

android_webview/java/src/org/chromium/android_webview/AwContents.java

Index: android_webview/java/src/org/chromium/android_webview/AwContents.java
diff --git a/android_webview/java/src/org/chromium/android_webview/AwContents.java b/android_webview/java/src/org/chromium/android_webview/AwContents.java
index 1ff77844015636e6e541636ed1656614e2763a15..5a17627c55883cf5a9db586cd5275ba309c15ca9 100644
--- a/android_webview/java/src/org/chromium/android_webview/AwContents.java
+++ b/android_webview/java/src/org/chromium/android_webview/AwContents.java
@@ -494,9 +494,11 @@ public class AwContents {
         AwSettings.ZoomSupportChangeListener zoomListener =
                 new AwSettings.ZoomSupportChangeListener() {
                     @Override
-                    public void onMultiTouchZoomSupportChanged(boolean supportsMultiTouchZoom) {
-                        mContentViewCore.updateMultiTouchZoomSupport(supportsMultiTouchZoom);
+                    public void onGestureZoomSupportChanged(boolean supportsGestureZoom) {
+                        mContentViewCore.updateMultiTouchZoomSupport(supportsGestureZoom);
+                        mContentViewCore.updateDoubleTapDragSupport(supportsGestureZoom);
                     }
+
                 };
         mSettings = new AwSettings(mContainerView.getContext(), hasInternetPermission, zoomListener,
                 isAccessFromFileURLsGrantedByDefault, mDIPScale);
@@ -884,7 +886,7 @@ public class AwContents {
     }
 
     public boolean isMultiTouchZoomSupported() {
-        return mSettings.supportsMultiTouchZoom();
+        return mSettings.supportsGestureZoom();
     }
 
     public View getZoomControlsForTest() {