Ignores mouse motion events when mouse is pressed or drag and drop is in progress

ui/views/corewm/tooltip_controller.h

Index: ui/views/corewm/tooltip_controller.h
diff --git a/ui/views/corewm/tooltip_controller.h b/ui/views/corewm/tooltip_controller.h
index 9815df1817a46d4f76cf17c459310b0502a34ead..0b86a4a85d971fda9292090081fb9fab96e1e9eb 100644
--- a/ui/views/corewm/tooltip_controller.h
+++ b/ui/views/corewm/tooltip_controller.h
@@ -57,6 +57,9 @@ class VIEWS_EXPORT TooltipController : public aura::client::TooltipClient,
  private:
   friend class test::TooltipControllerTestHelper;
 
+  // Dispatches mouse events in a posted task.
+  void DispatchMouseEvent(ui::EventType event_type, aura::Window* target);
+
   void TooltipTimerFired();
   void TooltipShownTimerFired();
 
@@ -94,6 +97,12 @@ class VIEWS_EXPORT TooltipController : public aura::client::TooltipClient,
   // this timer fires.
   base::OneShotTimer<TooltipController> tooltip_shown_timer_;
 
+  // Timer to throttle mouse movement events.
+  base::OneShotTimer<TooltipController> mouse_event_timer_;
+
+  // Location of the last event in screen coordinates.
+  gfx::Point last_mouse_location_;
+
   // Location of the last event in |tooltip_window_|'s coordinates.
   gfx::Point curr_mouse_loc_;