Fix "modal isn't modal in multi displays" issue

ash/wm/system_modal_container_layout_manager.h

Index: ash/wm/system_modal_container_layout_manager.h
diff --git a/ash/wm/system_modal_container_layout_manager.h b/ash/wm/system_modal_container_layout_manager.h
index be35747b0be07be361b48e863ed53e2cf0274acc..19d6319c82fd61126eb35c4d68e837565469e1ad 100644
--- a/ash/wm/system_modal_container_layout_manager.h
+++ b/ash/wm/system_modal_container_layout_manager.h
@@ -54,8 +54,9 @@ class ASH_EXPORT SystemModalContainerLayoutManager
   // Overridden from keyboard::KeyboardControllerObserver:
   void OnKeyboardBoundsChanging(const gfx::Rect& new_bounds) override;
 
-  // Can a given |window| receive and handle input events?
-  bool CanWindowReceiveEvents(aura::Window* window);
+  // True if the window is either contianed by the top most modal window,

[James Cook, 2016/06/16 20:31:35]

nit: "contained"

[oshima, 2016/06/17 00:06:12]

Done.

+  // or contained by its transient children.
+  bool IsActiveModalWindows(aura::Window* window);

[James Cook, 2016/06/16 20:31:36]

nit: maybe IsActiveModalWindow() singular?

[oshima, 2016/06/17 00:06:12]

There can be multiple windows that are part of active window. It could be
transient window, or TYPE_CHILD window for example.

I'm happy to change if you have better idea, so let me know.
(I was using "IsPartOfActiveModalWindow".)

[James Cook, 2016/06/17 16:04:43]

IsPartOfActiveModalWindow() sounds good.

[oshima, 2016/06/18 09:21:44]

Done.

 
   // Activates next modal window if any. Returns false if there
   // are no more modal windows in this layout manager.