[ios] Adds a provider API for AudioSessionController.

ios/public/provider/chrome/browser/voice/BUILD.gn

Index: ios/public/provider/chrome/browser/voice/BUILD.gn
diff --git a/chrome/installer/launcher_support/BUILD.gn b/ios/public/provider/chrome/browser/voice/BUILD.gn
similarity index 58%
copy from chrome/installer/launcher_support/BUILD.gn
copy to ios/public/provider/chrome/browser/voice/BUILD.gn
index 9abab50df0aefabdc299b6795e0fee8f77ee83f2..4f160a7a3b1a24f6b95ec457ef5ba8b02282f2c6 100644
--- a/chrome/installer/launcher_support/BUILD.gn
+++ b/ios/public/provider/chrome/browser/voice/BUILD.gn
@@ -2,13 +2,14 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-source_set("launcher_support") {
+source_set("test_support") {
   sources = [
-    "chrome_launcher_support.cc",
-    "chrome_launcher_support.h",
+    "test_audio_session_controller.cc",
+    "test_audio_session_controller.h",
   ]
 
   deps = [
     "//base",
+    "//ios/public/provider/chrome/browser",
   ]
 }