Pass tap count (1 or 2) with tap gesture events

ui/base/gestures/gesture_types.cc

Index: ui/base/gestures/gesture_types.cc
diff --git a/ui/base/gestures/gesture_types.cc b/ui/base/gestures/gesture_types.cc
index 2d329803be72029844d4b22839589e78ba6ae142..55dc7a17bbafe89efff7460b39dce857674661ac 100644
--- a/ui/base/gestures/gesture_types.cc
+++ b/ui/base/gestures/gesture_types.cc
@@ -39,6 +39,11 @@ GestureEventDetails::GestureEventDetails(ui::EventType type,
       data.swipe.down = delta_y > 0;
       break;
 
+    case ui::ET_GESTURE_TAP:
+      data.tap_count = static_cast<int>(delta_x);
+      CHECK_EQ(0.f, delta_y) << "Unknown data in delta_y for tap.";
+      break;
+
     default:
       data.generic.delta_x = delta_x;
       data.generic.delta_y = delta_y;