gesture recognizer: Recognizer rotation gestures.

ui/base/gestures/gesture_types.h

 // 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.
 
 #ifndef UI_BASE_GESTURES_GESTURE_TYPES_H_
 #define UI_BASE_GESTURES_GESTURE_TYPES_H_
 
 #include "base/logging.h"
 #include "base/time.h"
 #include "ui/base/events/event_constants.h"
@@ skipping 42 matching lines @@
                                                 data.scroll_update.velocity_y;
   }
 
   int touch_id() const {
     CHECK_EQ(ui::ET_GESTURE_LONG_PRESS, type_);
     return data.touch_id;
   }
 
   float scale() const {
     CHECK_EQ(ui::ET_GESTURE_PINCH_UPDATE, type_);
-    return data.scale;
+    return data.pinch.scale;
+  }
+
+  float rotation() const {
+    CHECK_EQ(ui::ET_GESTURE_PINCH_UPDATE, type_);
+    return data.pinch.rotation;
   }
 
   bool swipe_left() const {
     CHECK_EQ(ui::ET_GESTURE_MULTIFINGER_SWIPE, type_);
     return data.swipe.left;
   }
 
   bool swipe_right() const {
     CHECK_EQ(ui::ET_GESTURE_MULTIFINGER_SWIPE, type_);
     return data.swipe.right;
@@ skipping 17 matching lines @@
  private:
   ui::EventType type_;
   union {
     struct {  // SCROLL delta.
       float x;
       float y;
       float velocity_x;
       float velocity_y;
     } scroll_update;
 
-    float scale;  // PINCH scale.
+    struct {  // PINCH scale, rotation.
+      float scale;
+      float rotation;
+    } pinch;
 
     struct {  // FLING velocity.
       float x;
       float y;
     } fling_velocity;
 
     int touch_id;  // LONG_PRESS touch-id.
 
     struct {  // SWIPE direction.
       bool left;
@@ skipping 41 matching lines @@
   virtual ~GestureEventHelper() {
   }
 
   virtual bool DispatchLongPressGestureEvent(GestureEvent* event) = 0;
   virtual bool DispatchCancelTouchEvent(TouchEvent* event) = 0;
 };
 
 }  // namespace ui
 
 #endif  // UI_BASE_GESTURES_GESTURE_TYPES_H_