Context menu on views must show on mouse down for non-WIN.

ui/views/controls/menu/menu_runner.cc

Index: ui/views/controls/menu/menu_runner.cc
diff --git a/ui/views/controls/menu/menu_runner.cc b/ui/views/controls/menu/menu_runner.cc
index 694503cc3fc3cd3b54ccb05eceef551ca88e76d5..c7ed7a3b8032cf19a731a1440f8257bfe312d928 100644
--- a/ui/views/controls/menu/menu_runner.cc
+++ b/ui/views/controls/menu/menu_runner.cc
@@ -341,6 +341,12 @@ MenuRunner::RunResult MenuRunner::RunMenuAt(Widget* parent,
     anchor = parent->GetCurrentEvent()->IsGestureEvent() ?
         MenuItemView::BOTTOMCENTER : MenuItemView::TOPLEFT;
 
+  // If we are shown on mouse press, we will eat the subsequent mouse down and
+  // the parent widget will not be able to reset its state (it might have mouse
+  // capture from the mouse down). So we clear its state here.
+  if (parent && parent->GetRootView())
+    parent->GetRootView()->SetMouseHandler(NULL);
+
   return holder_->RunMenuAt(parent, button, bounds, anchor, types);
 }