gesture recognizer: Recognizer rotation gestures.

ui/base/gestures/gesture_types.cc

 // 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.
 
 #include "ui/base/gestures/gesture_types.h"
 
 namespace ui {
 
 GestureEventDetails::GestureEventDetails(ui::EventType type,
                                          float delta_x,
@@ skipping 10 matching lines @@
       data.fling_velocity.x = delta_x;
       data.fling_velocity.y = delta_y;
       break;
 
     case ui::ET_GESTURE_LONG_PRESS:
       data.touch_id = static_cast<int>(delta_x);
       CHECK_EQ(0.f, delta_y) << "Unknown data in delta_y for long press.";
       break;
 
     case ui::ET_GESTURE_PINCH_UPDATE:
-      data.scale = delta_x;
-      CHECK_EQ(0.f, delta_y) << "Unknown data in delta_y for pinch";
+      data.pinch.scale = delta_x;
+      data.pinch.rotation = delta_y;
       break;
 
     case ui::ET_GESTURE_MULTIFINGER_SWIPE:
       data.swipe.left = delta_x < 0;
       data.swipe.right = delta_x > 0;
       data.swipe.up = delta_y < 0;
       data.swipe.down = delta_y > 0;
       break;
 
     case ui::ET_GESTURE_TAP:
@@ skipping 11 matching lines @@
 }
 
 void GestureEventDetails::SetScrollVelocity(float velocity_x,
                                             float velocity_y) {
   CHECK_EQ(ui::ET_GESTURE_SCROLL_UPDATE, type_);
   data.scroll_update.velocity_x = velocity_x;
   data.scroll_update.velocity_y = velocity_y;
 }
 
 }  // namespace ui