aura: Fix launcher tooltips:

ui/views/bubble/bubble_frame_view.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/views/bubble/bubble_frame_view.h"
 
 #include <algorithm>
 
 #include "ui/gfx/screen.h"
 #include "ui/views/bubble/bubble_border.h"
@@ skipping 73 matching lines @@
     MirrorArrowIfOffScreen(false, anchor_rect, client_size);
   }
 
   // Calculate the bounds with the arrow in its updated location.
   return bubble_border_->GetBounds(anchor_rect, client_size);
 }
 
 void BubbleFrameView::SetBubbleBorder(BubbleBorder* border) {
   bubble_border_ = border;
   set_border(bubble_border_);
+
+  // Update the background, which relies on the border.
+  set_background(new views::BubbleBackground(border));
 }
 
 gfx::Rect BubbleFrameView::GetMonitorBounds(const gfx::Rect& rect) {
   return gfx::Screen::GetDisplayNearestPoint(rect.CenterPoint()).work_area();
 }
 
 void BubbleFrameView::MirrorArrowIfOffScreen(
     bool vertical,
     const gfx::Rect& anchor_rect,
     const gfx::Size& client_size) {
@@ skipping 11 matching lines @@
     // Restore the original arrow if mirroring doesn't show more of the bubble.
     if (GetOffScreenLength(monitor_rect, mirror_bounds, vertical) >=
         GetOffScreenLength(monitor_rect, window_bounds, vertical))
       bubble_border_->set_arrow_location(arrow);
     else
       SchedulePaint();
   }
 }
 
 }  // namespace views