Add multi-finger swipe detection to GestureDetector

ui/events/gesture_detection/gesture_provider.cc

Index: ui/events/gesture_detection/gesture_provider.cc
diff --git a/ui/events/gesture_detection/gesture_provider.cc b/ui/events/gesture_detection/gesture_provider.cc
index f2d6f32e8c3da3b5331dab55be7f854e51f7f856..2d2a775308c5e15222289ad4fa40d14dfae97bdf 100644
--- a/ui/events/gesture_detection/gesture_provider.cc
+++ b/ui/events/gesture_detection/gesture_provider.cc
@@ -258,7 +258,7 @@ class GestureProvider::GestureListenerImpl
       SetIgnoreSingleTap(true);
 
     if (e.GetAction() == MotionEvent::ACTION_DOWN)
-      gesture_detector_.set_is_longpress_enabled(true);
+      gesture_detector_.set_longpress_enabled(true);
 
     return gesture_detector_.OnTouchEvent(e);
   }
@@ -349,6 +349,17 @@ class GestureProvider::GestureListenerImpl
     return true;
   }
 
+  virtual bool OnSwipe(const MotionEvent& e1,
+                       const MotionEvent& e2,
+                       float velocity_x,
+                       float velocity_y) OVERRIDE {
+    GestureEventDetails swipe_details(
+        ET_GESTURE_MULTIFINGER_SWIPE, velocity_x, velocity_y);
+    provider_->Send(
+        CreateGesture(ET_GESTURE_MULTIFINGER_SWIPE, e2, swipe_details));
+    return true;
+  }
+
   virtual void OnShowPress(const MotionEvent& e) OVERRIDE {
     GestureEventDetails show_press_details(ET_GESTURE_SHOW_PRESS, 0, 0);
     // TODO(jdduke): Expose minor axis length and rotation in |MotionEvent|.
@@ -406,7 +417,7 @@ class GestureProvider::GestureListenerImpl
   virtual bool OnDoubleTapEvent(const MotionEvent& e) OVERRIDE {
     switch (e.GetAction()) {
       case MotionEvent::ACTION_DOWN:
-        gesture_detector_.set_is_longpress_enabled(false);
+        gesture_detector_.set_longpress_enabled(false);
         break;
 
       case MotionEvent::ACTION_UP: