[ios] Adds support for parsing Text-to-Speech search results.

ios/chrome/browser/voice/text_to_speech_parser.h

Index: ios/chrome/browser/voice/text_to_speech_parser.h
diff --git a/ios/chrome/browser/voice/text_to_speech_parser.h b/ios/chrome/browser/voice/text_to_speech_parser.h
new file mode 100644
index 0000000000000000000000000000000000000000..c0e0294153c4dba3112772369ab96a2dbd2e7268
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+++ b/ios/chrome/browser/voice/text_to_speech_parser.h
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+// 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.
+
+#ifndef IOS_CHROME_BROWSER_VOICE_TEXT_TO_SPEECH_PARSER_H_
+#define IOS_CHROME_BROWSER_VOICE_TEXT_TO_SPEECH_PARSER_H_
+
+#import <Foundation/Foundation.h>
+
+namespace web {
+class WebState;
+}
+
+// Extracts TTS audio data from |webState|'s HTML using the start and end tags
+// for Google Voice Search result pages.
+typedef void (^TextToSpeechCompletion)(NSData*);
+void ExtractVoiceSearchAudioDataFromWebState(web::WebState* webState,
+                                             TextToSpeechCompletion completion);
+
+#endif  // IOS_CHROME_BROWSER_VOICE_TEXT_TO_SPEECH_PARSER_H_