Add AudioStreamRegistry. Move stream counting logic

content/browser/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/features.gni")
 import("//build/config/ui.gni")
 import("//media/media_options.gni")
 import("//ppapi/features/features.gni")
 import("//printing/features/features.gni")
 import("//third_party/WebKit/public/public_features.gni")
@@ skipping 1091 matching lines @@
     "renderer_host/media/audio_input_renderer_host.cc",
     "renderer_host/media/audio_input_renderer_host.h",
     "renderer_host/media/audio_input_sync_writer.cc",
     "renderer_host/media/audio_input_sync_writer.h",
     "renderer_host/media/audio_output_authorization_handler.cc",
     "renderer_host/media/audio_output_authorization_handler.h",
     "renderer_host/media/audio_output_delegate.cc",
     "renderer_host/media/audio_output_delegate.h",
     "renderer_host/media/audio_renderer_host.cc",
     "renderer_host/media/audio_renderer_host.h",
+    "renderer_host/media/audio_stream_registry.h",
+    "renderer_host/media/audio_stream_registry_impl.cc",
+    "renderer_host/media/audio_stream_registry_impl.h",
     "renderer_host/media/audio_sync_reader.cc",
     "renderer_host/media/audio_sync_reader.h",
     "renderer_host/media/media_capture_devices_impl.cc",
     "renderer_host/media/media_capture_devices_impl.h",
     "renderer_host/media/media_devices_dispatcher_host.cc",
     "renderer_host/media/media_devices_dispatcher_host.h",
     "renderer_host/media/media_devices_manager.cc",
     "renderer_host/media/media_devices_manager.h",
     "renderer_host/media/media_stream_dispatcher_host.cc",
     "renderer_host/media/media_stream_dispatcher_host.h",
@@ skipping 862 matching lines @@
   if (!is_component_build) {
     public_deps = [
       ":browser",
     ]
   } else {
     public_deps = [
       "//third_party/leveldatabase",
     ]
   }
 }