app_list: Fix shadow bleeds over launcher button and steals mouse events

ui/app_list/app_list_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/app_list/app_list_view.h"
 
 #include "ui/app_list/app_list_bubble_border.h"
 #include "ui/app_list/app_list_item_view.h"
 #include "ui/app_list/app_list_model.h"
 #include "ui/app_list/app_list_view_delegate.h"
@@ skipping 97 matching lines @@
     contents_view_->SetModel(new_model.get());
 
     model_.reset(new_model.release());
   }
 }
 
 views::View* AppListView::GetInitiallyFocusedView() {
   return search_box_view_->search_box();
 }
 
+bool AppListView::HasHitTestMask() const {
+  return true;
+}
+
+void AppListView::GetHitTestMask(gfx::Path* mask) const {
+  DCHECK(mask);
+  bubble_border_->GetMask(GetBubbleFrameView()->bounds(), mask);
+}
+
 bool AppListView::OnKeyPressed(const views::KeyEvent& event) {
   if (event.key_code() == ui::VKEY_ESCAPE) {
     Close();
     return true;
   }
 
   return false;
 }
 
 void AppListView::ButtonPressed(views::Button* sender,
@@ skipping 64 matching lines @@
   }
 }
 
 void AppListView::OpenResult(const SearchResult& result, int event_flags) {
   if (delegate_.get())
     delegate_->OpenSearchResult(result, event_flags);
   Close();
 }
 
 }  // namespace app_list