Fix volume slider to emit value changed events and do not focus system tray item for transient views

chrome/browser/chromeos/accessibility/spoken_feedback_browsertest.cc

 // Copyright 2014 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 <queue>
 
 #include "ash/accelerators/accelerator_controller.h"
 #include "ash/accelerators/accelerator_table.h"
 #include "ash/shell.h"
 #include "ash/system/tray/system_tray.h"
@@ skipping 404 matching lines @@
                                  "Brightness * percent"));
 
   EXPECT_TRUE(PerformAcceleratorAction(ash::BRIGHTNESS_DOWN));
   EXPECT_TRUE(base::MatchPattern(speech_monitor_.GetNextUtterance(),
                                  "Brightness * percent"));
 }
 
 IN_PROC_BROWSER_TEST_P(SpokenFeedbackTest, VolumeSlider) {
   EnableChromeVox();
 
+  // Volume slider does not fire valueChanged event on first key press because
+  // it has no widget.
+  EXPECT_TRUE(PerformAcceleratorAction(ash::VOLUME_UP));
   EXPECT_TRUE(PerformAcceleratorAction(ash::VOLUME_UP));
   EXPECT_TRUE(
       base::MatchPattern(speech_monitor_.GetNextUtterance(), "* percent*"));
   EXPECT_EQ("Volume,", speech_monitor_.GetNextUtterance());
   EXPECT_EQ("slider", speech_monitor_.GetNextUtterance());
 }
 
 IN_PROC_BROWSER_TEST_P(SpokenFeedbackTest, OverviewMode) {
   EnableChromeVox();
 
@@ skipping 258 matching lines @@
   ASSERT_TRUE(ui_test_utils::SendKeyPressToWindowSync(
       window, ui::VKEY_TAB, false, true /*shift*/, false, false));
   while (speech_monitor_.GetNextUtterance() != "Select your language:") {
   }
   EXPECT_EQ("English ( United States)", speech_monitor_.GetNextUtterance());
   EXPECT_TRUE(base::MatchPattern(speech_monitor_.GetNextUtterance(),
                                  "Combo box * of *"));
 }
 
 }  // namespace chromeos