Toggle spoken feedback if two fingers are held down.

chrome/browser/chromeos/accessibility/accessibility_manager.cc

 // Copyright (c) 2013 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 "chrome/browser/chromeos/accessibility/accessibility_manager.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <memory>
@@ skipping 277 matching lines @@
       bundle.GetRawDataResource(IDR_SOUND_SPOKEN_FEEDBACK_ENABLED_WAV));
   manager->Initialize(
       SOUND_SPOKEN_FEEDBACK_DISABLED,
       bundle.GetRawDataResource(IDR_SOUND_SPOKEN_FEEDBACK_DISABLED_WAV));
   manager->Initialize(SOUND_PASSTHROUGH,
                       bundle.GetRawDataResource(IDR_SOUND_PASSTHROUGH_WAV));
   manager->Initialize(SOUND_EXIT_SCREEN,
                       bundle.GetRawDataResource(IDR_SOUND_EXIT_SCREEN_WAV));
   manager->Initialize(SOUND_ENTER_SCREEN,
                       bundle.GetRawDataResource(IDR_SOUND_ENTER_SCREEN_WAV));
+  manager->Initialize(SOUND_SPOKEN_FEEDBACK_TOGGLE_COUNTDOWN_HIGH,
+                      bundle.GetRawDataResource(
+                          IDR_SOUND_SPOKEN_FEEDBACK_TOGGLE_COUNTDOWN_HIGH_WAV));
+  manager->Initialize(SOUND_SPOKEN_FEEDBACK_TOGGLE_COUNTDOWN_LOW,
+                      bundle.GetRawDataResource(
+                          IDR_SOUND_SPOKEN_FEEDBACK_TOGGLE_COUNTDOWN_LOW_WAV));
 
   base::FilePath resources_path;
   if (!PathService::Get(chrome::DIR_RESOURCES, &resources_path))
     NOTREACHED();
   chromevox_loader_ = base::WrapUnique(new AccessibilityExtensionLoader(
       extension_misc::kChromeVoxExtensionId,
       resources_path.Append(extension_misc::kChromeVoxExtensionPath),
       base::Bind(&AccessibilityManager::PostUnloadChromeVox,
                  weak_ptr_factory_.GetWeakPtr())));
   select_to_speak_loader_ = base::WrapUnique(new AccessibilityExtensionLoader(
@@ skipping 227 matching lines @@
   // If the system locale changes and spoken feedback is enabled,
   // reload ChromeVox so that it switches its internal translations
   // to the new language.
   EnableSpokenFeedback(false, ash::A11Y_NOTIFICATION_NONE);
   EnableSpokenFeedback(true, ash::A11Y_NOTIFICATION_NONE);
 }
 
 bool AccessibilityManager::PlayEarcon(int sound_key, PlaySoundOption option) {
   DCHECK(sound_key < chromeos::SOUND_COUNT);
   base::CommandLine* cl = base::CommandLine::ForCurrentProcess();
-  if (cl->HasSwitch(kAshDisableSystemSounds))
+  if (cl->HasSwitch(kAshDisableSystemSounds)) {
     return false;
+  }

[oshima, 2016/11/08 18:14:43]

nuke {}

[dmazzoni, 2016/11/08 20:43:47]

Done.

   if (option == PlaySoundOption::SPOKEN_FEEDBACK_ENABLED &&
       !IsSpokenFeedbackEnabled() && !cl->HasSwitch(kAshEnableSystemSounds)) {
     return false;
   }
   return media::SoundsManager::Get()->Play(sound_key);
 }
 
+bool AccessibilityManager::PlaySpokenFeedbackToggleCountdown(int tick_count) {
+  // When the user holds down two fingers on a touch screen, play
+  // alternating high and low tick sounds to warn the user that something
+  // is going to happen, until the elapsed time has passed to enable
+  // spoken feedback.

[oshima, 2016/11/08 18:14:43]

and consolidate this with the comment in the header. (whichever you like)

[dmazzoni, 2016/11/08 20:43:47]

Removed this one, I'll just leave the main comment where this is called

+  return media::SoundsManager::Get()->Play(
+      tick_count % 2 ? SOUND_SPOKEN_FEEDBACK_TOGGLE_COUNTDOWN_HIGH
+                     : SOUND_SPOKEN_FEEDBACK_TOGGLE_COUNTDOWN_LOW);
+}
+
 void AccessibilityManager::HandleAccessibilityGesture(ui::AXGesture gesture) {
   extensions::EventRouter* event_router =
       extensions::EventRouter::Get(profile());
   CHECK(event_router);
 
   std::unique_ptr<base::ListValue> event_args(new base::ListValue());
   event_args->AppendString(ui::ToString(gesture));
   std::unique_ptr<extensions::Event> event(new extensions::Event(
       extensions::events::ACCESSIBILITY_PRIVATE_ON_ACCESSIBILITY_GESTURE,
       extensions::api::accessibility_private::OnAccessibilityGesture::
@@ skipping 794 matching lines @@
     content::BrowserContext* context) {
   keyboard_listener_extension_id_ = id;
 
   extensions::ExtensionRegistry* registry =
       extensions::ExtensionRegistry::Get(context);
   if (!extension_registry_observer_.IsObserving(registry) && !id.empty())
     extension_registry_observer_.Add(registry);
 }
 
 }  // namespace chromeos