Fix Z-order for a bubble when it appears for inactive window.

ui/views/win/hwnd_message_handler.cc

Index: ui/views/win/hwnd_message_handler.cc
diff --git a/ui/views/win/hwnd_message_handler.cc b/ui/views/win/hwnd_message_handler.cc
index 76818369d93dce38782d3d3315b9300762886c74..253829cb01e249dba04cb33dede6732100e6a0fe 100644
--- a/ui/views/win/hwnd_message_handler.cc
+++ b/ui/views/win/hwnd_message_handler.cc
@@ -533,7 +533,10 @@ void HWNDMessageHandler::SetRegion(HRGN region) {
 }
 
 void HWNDMessageHandler::StackAbove(HWND other_hwnd) {
-  SetWindowPos(hwnd(), other_hwnd, 0, 0, 0, 0,
+  // Find a window above |other_hwnd|. If it exists, place hwnd() behind it.

[sky, 2015/06/05 15:27:41]

This comment just describes what the code is doing. Document why it is like that
instead of the more straightforward old code.

[vasilii, 2015/06/05 15:37:26]

Done.

+  // Otherwise, make hwnd() a top window.
+  HWND next_window = GetNextWindow(other_hwnd, GW_HWNDPREV);

[sky, 2015/06/05 15:27:41]

DCHECK(other_hwnd)

[vasilii, 2015/06/05 15:37:26]

Done.

+  SetWindowPos(hwnd(), next_window ? next_window : HWND_TOP, 0, 0, 0, 0,
                SWP_NOSIZE | SWP_NOMOVE | SWP_NOACTIVATE);
 }