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

ios/chrome/browser/voice/voice_search_url_rewriter.h

+// Copyright 2016 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_VOICE_SEARCH_URL_REWRITER_H_
+#define IOS_CHROME_BROWSER_VOICE_VOICE_SEARCH_URL_REWRITER_H_
+
+class GURL;
+namespace web {
+class BrowserState;
+}
+
+// Adds the voice search flags to |url| if it's a Google search URL.  This
+// function is a web::BrowserURLRewriter::URLRewriter, and is intended to be
+// used as a transient URLRewriter when performing a Google Search using Voice
+// Search.
+bool VoiceSearchURLRewriter(GURL* url, web::BrowserState* browser_state);
+
+#endif  // IOS_CHROME_BROWSER_VOICE_VOICE_SEARCH_URL_REWRITER_H_