Enables hot-tracking for overflow extension buttons in the app menu

chrome/browser/ui/views/toolbar/toolbar_action_view_interactive_uitest.cc

 // Copyright 2015 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 "base/macros.h"
 #include "base/run_loop.h"
 #include "base/strings/string_number_conversions.h"
 #include "chrome/browser/extensions/extension_action_test_util.h"
 #include "chrome/browser/extensions/extension_browsertest.h"
 #include "chrome/browser/extensions/extension_service.h"
@@ skipping 54 matching lines @@
 
 void ActivateOverflowedActionWithKeyboard(Browser* browser,
                                           const base::Closure& closure) {
   AppMenuButton* app_menu_button = GetAppButtonFromBrowser(browser);
   EXPECT_TRUE(app_menu_button->IsMenuShowing());
   // We need to dispatch key events to the menu's native window, rather than the
   // browser's.
   gfx::NativeWindow native_window =
       views::MenuController::GetActiveInstance()->owner()->GetNativeWindow();
 
-  // Send two key down events followed by the return key.
-  // The two key down events target the toolbar action in the app menu.
-  // TODO(devlin): Shouldn't this be one key down event?
+  // Send a key down event followed by the return key.
+  // The key down event targets the toolbar action in the app menu.
   ui_controls::SendKeyPress(native_window,
                             ui::VKEY_DOWN,
                             false, false, false, false);
-  ui_controls::SendKeyPress(native_window,
-                            ui::VKEY_DOWN,
-                            false, false, false, false);
   ui_controls::SendKeyPressNotifyWhenDone(native_window,
                             ui::VKEY_RETURN,
                             false, false, false, false, closure);
 }
 
 // Tests the context menu of an overflowed action.
 void TestWhileContextMenuOpen(bool* did_test_while_menu_open,
                               Browser* browser,
                               ToolbarActionView* context_menu_action) {
   *did_test_while_menu_open = true;
@@ skipping 300 matching lines @@
       ui_controls::LEFT, ui_controls::DOWN | ui_controls::UP,
       base::Bind(&ActivateOverflowedActionWithKeyboard,
                  browser(), loop.QuitClosure()));
   loop.Run();
 
   // The app menu should no longer be showing.
   EXPECT_FALSE(app_menu_button->IsMenuShowing());
   // And the extension should have been activated.
   EXPECT_TRUE(listener.WaitUntilSatisfied());
 }