Aura: don't synthesize mouse moves while holding pointer.

ui/aura/root_window.cc

Index: ui/aura/root_window.cc
diff --git a/ui/aura/root_window.cc b/ui/aura/root_window.cc
index 128a04424d45ae084e9b6ecfbd659e1d1b42979a..991ebb581c1cea73894c645197d062d43c0d6d79 100644
--- a/ui/aura/root_window.cc
+++ b/ui/aura/root_window.cc
@@ -830,6 +830,8 @@ void RootWindow::PreDispatchMouseEvent(Window* target,
 
   if (IsEventCandidateForHold(*event) && !dispatching_held_event_) {
     if (move_hold_count_) {
+      if (event->type() != ui::ET_MOUSE_CAPTURE_CHANGED)

[sky, 2014/02/14 16:40:05]

I think you should be selective here. Meaning use equality rather than
inequality. The way you have it now you'll include ET_TOUCH_MOVED, which
shouldn't effect the mouse location.

[dgozman, 2014/02/17 14:19:59]

It's inside PreDispatchMouseEvent. The only mouse event we shouldn't update
location is ET_MOUSE_CAPTURE_CHANGED.
I've added check for synthetic event though.

+        SetLastMouseLocation(window(), event->root_location());
       held_move_event_.reset(new ui::MouseEvent(*event, target, window()));
       event->SetHandled();
       return;