exo: Replace fling cancel with generic zero distance scroll

components/exo/pointer.cc

Index: components/exo/pointer.cc
diff --git a/components/exo/pointer.cc b/components/exo/pointer.cc
index 46fbcb109b8397317b0599b9f6c6e5d28149da82..4d5c64fc02b43975cff15ae6370b547b2a88d5d9 100644
--- a/components/exo/pointer.cc
+++ b/components/exo/pointer.cc
@@ -247,8 +247,11 @@ void Pointer::OnMouseEvent(ui::MouseEvent* event) {
       }
       break;
     case ui::ET_SCROLL_FLING_CANCEL:
-      if (focus_) {
-        delegate_->OnPointerScrollCancel(event->time_stamp());

[reveman, 2016/10/31 02:25:12]

can we remove OnPointerScrollCancel from the delegate interface?

[denniskempin, 2016/10/31 17:33:48]

Done.

+      if (focus_ && last_event_type_ == ui::ET_SCROLL_FLING_START) {
+        delegate_->OnPointerScroll(event->time_stamp(), gfx::Vector2dF(),
+                                   false);
+        delegate_->OnPointerFrame();
+        delegate_->OnPointerScrollStop(event->time_stamp());
         delegate_->OnPointerFrame();
       }
       break;
@@ -286,6 +289,9 @@ void Pointer::OnMouseEvent(ui::MouseEvent* event) {
     if (widget_ && widget_->IsVisible())
       widget_->Hide();
   }
+
+  if ((event->flags() & ui::EF_IS_SYNTHESIZED) == 0)

[reveman, 2016/10/31 02:25:12]

can we merge this with the "event->flags() & ui::EF_IS_SYNTHESIZED" if statement
above?

[denniskempin, 2016/10/31 17:33:49]

Done.

+    last_event_type_ = event->type();
 }
 
 void Pointer::OnScrollEvent(ui::ScrollEvent* event) {