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

ios/chrome/browser/voice/BUILD.gn

 # 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.
 
 source_set("voice") {
   sources = [
     "speech_input_locale.h",
     "speech_input_locale_config.h",
     "speech_input_locale_config.mm",
     "speech_input_locale_config_impl.h",
     "speech_input_locale_config_impl.mm",
     "speech_input_locale_match_config.h",
     "speech_input_locale_match_config.mm",
   ]
 
   public_deps = [
     "//base",
     "//ios/chrome/browser",
     "//ios/public/provider/chrome/browser",
   ]
 }
+
+source_set("tts") {
+  sources = [
+    "text_to_speech_listener.h",
+    "text_to_speech_listener.mm",
+    "text_to_speech_parser.h",
+    "text_to_speech_parser.mm",
+    "voice_search_url_rewriter.h",
+    "voice_search_url_rewriter.mm",
+  ]
+
+  deps = [
+    ":voice",
+    "//base",
+    "//components/google/core/browser",
+    "//components/prefs",
+    "//ios/chrome/browser",
+    "//ios/public/provider/chrome/browser",
+    "//ios/web",
+    "//net",
+    "//third_party/google_toolbox_for_mac",
+    "//url",
+  ]
+}
+
+source_set("unit_tests") {
+  testonly = true
+
+  sources = [
+    "text_to_speech_listener_unittest.mm",
+    "text_to_speech_parser_unittest.mm",
+  ]
+
+  deps = [
+    "//base",
+    "//ios/web",
+    "//ios/web:test_support",
+    "//testing/gtest",
+    "//third_party/google_toolbox_for_mac",
+  ]
+
+  public_deps = [
+    ":tts",
+  ]
+}