[ios] Adds a VoiceSearchController interface to the provider layer.

ios/public/provider/chrome/browser/voice/voice_search_controller.h

+// Copyright 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.
+
+#ifndef IOS_PUBLIC_PROVIDER_CHROME_BROWSER_VOICE_VOICE_SEARCH_CONTROLLER_IMPL_H_
+#define IOS_PUBLIC_PROVIDER_CHROME_BROWSER_VOICE_VOICE_SEARCH_CONTROLLER_IMPL_H_
+
+#include "base/memory/ref_counted.h"
+
+@class Tab;
+@class UIViewController;
+@protocol VoiceSearchControllerDelegate;
+
+// TODO(crbug.com/607204): Convert to Objective-C class.
+class VoiceSearchController
+    : public base::RefCountedThreadSafe<VoiceSearchController> {
+ public:
+  VoiceSearchController();
+
+  // Sets the delegate for this object.
+  virtual void SetDelegate(id<VoiceSearchControllerDelegate> delegate);
+
+  // Preloads views and view controllers needed for the voice search UI.
+  virtual void PrepareToAppear();
+
+  // Starts recognizing and recording process. Will call the delegate method
+  // upon completion if the recognition succeeds.
+  // |presenting_view_controller| is the UIViewController from which to present
+  // the Voice Search input UI.
+  virtual void StartRecognition(UIViewController* presenting_view_controller,
+                                Tab* current_tab);
+
+  // Whether or not the Text To Speech user preference is enabled.
+  virtual bool IsTextToSpeechEnabled();
+
+  // Returns whether Text To Speech is supported for the currently selected
+  // Voice Search language. If a Voice Search language has not been specified,
+  // returns whether Text To Speech is supported for the default Voice Search
+  // language.
+  virtual bool IsTextToSpeechSupported();
+
+  // Returns |true| if the voice search UI is visible.
+  virtual bool IsVisible();
+
+  // Returns |true| if text-to-speech audio is currently playing.
+  virtual bool IsPlayingAudio();
+
+  // Dismisses the mic permissions help UI, if shown.
+  virtual void DismissMicPermissionsHelp();
+
+ protected:
+  virtual ~VoiceSearchController();
+
+ private:
+  friend class base::RefCountedThreadSafe<VoiceSearchController>;
+
+  DISALLOW_COPY_AND_ASSIGN(VoiceSearchController);
+};
+
+#endif  // IOS_PUBLIC_PROVIDER_CHROME_BROWSER_VOICE_VOICE_SEARCH_CONTROLLER_IMPL_H_