Add AudioStreamRegistry. Move stream counting logic

content/test/BUILD.gn

 # Copyright 2014 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.
 
 import("//build/config/chrome_build.gni")
 import("//build/config/chromecast_build.gni")
 import("//build/config/compiler/compiler.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
@@ skipping 1183 matching lines @@
     "../browser/renderer_host/input/web_input_event_builders_android_unittest.cc",
     "../browser/renderer_host/input/web_input_event_builders_mac_unittest.mm",
     "../browser/renderer_host/input/web_input_event_util_unittest.cc",
     "../browser/renderer_host/media/audio_debug_file_writer_unittest.cc",
     "../browser/renderer_host/media/audio_input_device_manager_unittest.cc",
     "../browser/renderer_host/media/audio_input_renderer_host_unittest.cc",
     "../browser/renderer_host/media/audio_input_sync_writer_unittest.cc",
     "../browser/renderer_host/media/audio_output_authorization_handler_unittest.cc",
     "../browser/renderer_host/media/audio_output_delegate_unittest.cc",
     "../browser/renderer_host/media/audio_renderer_host_unittest.cc",
+    "../browser/renderer_host/media/audio_stream_registry_impl_unittest.cc",
     "../browser/renderer_host/media/media_devices_dispatcher_host_unittest.cc",
     "../browser/renderer_host/media/media_devices_manager_unittest.cc",
     "../browser/renderer_host/media/media_stream_dispatcher_host_unittest.cc",
     "../browser/renderer_host/media/media_stream_manager_unittest.cc",
     "../browser/renderer_host/media/media_stream_ui_proxy_unittest.cc",
     "../browser/renderer_host/media/video_capture_buffer_pool_unittest.cc",
     "../browser/renderer_host/media/video_capture_controller_unittest.cc",
     "../browser/renderer_host/media/video_capture_device_client_unittest.cc",
     "../browser/renderer_host/media/video_capture_manager_unittest.cc",
     "../browser/renderer_host/media/video_capture_unittest.cc",
@@ skipping 563 matching lines @@
   if (is_android) {
     deps += [ "//testing/android/native_test:native_test_native_code" ]
   }
 }
 
 group("fuzzers") {
   deps = [
     "//content/test/fuzzer",
   ]
 }