[Android] Reverse double-tap drag zoom direction.

content/public/android/java/src/org/chromium/content/browser/ContentViewGestureHandler.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.Bundle;
 import android.os.Handler;
 import android.os.SystemClock;
@@ skipping 566 matching lines @@
                                 } else if (mDoubleTapDragMode == DOUBLE_TAP_DRAG_MODE_ZOOM) {
                                     assert mExtraParamBundleDoubleTapDragZoom.isEmpty();
                                     sendGesture(GESTURE_SCROLL_BY, e.getEventTime(),
                                             (int) e.getX(), (int) e.getY(),
                                             mExtraParamBundleDoubleTapDragZoom);
 
                                     float dy = mDoubleTapY - e.getY();
                                     pinchBy(e.getEventTime(),
                                             Math.round(mDoubleTapDragZoomAnchorX),
                                             Math.round(mDoubleTapDragZoomAnchorY),
-                                            (float) Math.pow(dy < 0 ?
+                                            (float) Math.pow(dy > 0 ?
                                                     1.0f - DOUBLE_TAP_DRAG_ZOOM_SPEED :
                                                     1.0f + DOUBLE_TAP_DRAG_ZOOM_SPEED,
                                                     Math.abs(dy * mPxToDp)));
                                 }
                                 break;
                             case MotionEvent.ACTION_UP:
                                 if (mDoubleTapDragMode != DOUBLE_TAP_DRAG_MODE_ZOOM) {
                                     // Normal double tap gesture.
                                     sendMotionEventAsGesture(GESTURE_DOUBLE_TAP, e, null);
                                 }
@@ skipping 655 matching lines @@
         assert (mDoubleTapDragMode == DOUBLE_TAP_DRAG_MODE_DISABLED ||
                 mDoubleTapDragMode == DOUBLE_TAP_DRAG_MODE_NONE);
         mDoubleTapDragMode = supportDoubleTapDrag ?
                 DOUBLE_TAP_DRAG_MODE_NONE : DOUBLE_TAP_DRAG_MODE_DISABLED;
     }
 
     private boolean isDoubleTapDragDisabled() {
         return mDoubleTapDragMode == DOUBLE_TAP_DRAG_MODE_DISABLED;
     }
 }