aura: Long launcher tooltips should elide at end.

ui/views/controls/label.cc

Index: ui/views/controls/label.cc
diff --git a/ui/views/controls/label.cc b/ui/views/controls/label.cc
index 9412a6ab792a2827454cdbd828ea5ca720eb9828..7c07124e10fdbafa5ad34d2c8d0dc233507bf29d 100644
--- a/ui/views/controls/label.cc
+++ b/ui/views/controls/label.cc
@@ -360,6 +360,7 @@ void Label::Init(const string16& text, const gfx::Font& font) {
   is_multi_line_ = false;
   allow_character_break_ = false;
   elide_in_middle_ = false;
+  elide_at_end_ = false;
   is_email_ = false;
   collapse_when_hidden_ = false;
   directionality_mode_ = USE_UI_DIRECTIONALITY;
@@ -488,6 +489,9 @@ void Label::CalculateDrawStringParams(string16* paint_text,
   } else if (elide_in_middle_) {
     *paint_text = ui::ElideText(text_, font_, GetAvailableRect().width(),
                                 ui::ELIDE_IN_MIDDLE);
+  } else if (elide_at_end_) {
+    *paint_text = ui::ElideText(text_, font_, GetAvailableRect().width(),
+                                ui::ELIDE_AT_END);
   } else {
     *paint_text = text_;
   }