Set the AudioManager factory before the browser main loop.

chromecast/browser/cast_browser_main_parts.cc

 // 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.
 
 #include "chromecast/browser/cast_browser_main_parts.h"
 
 #if !defined(OS_ANDROID)
 #include <signal.h>
 #include <sys/prctl.h>
 #endif
@@ skipping 122 matching lines @@
     NOTREACHED();
   } else {
     DCHECK_EQ(sa_old.sa_handler, KillOnAlarm);
   }
 }
 #endif  // !defined(OS_ANDROID)
 
 }  // namespace
 
 namespace chromecast {
+
+namespace media {
+// Forward declaration of setter for audio manager factory. This method should
+// call ::media::AudioManager::SetAudioManagerFactory to provide a platform
+// implmentation of AudioManager.
+void SetPlatformAudioManagerFactory();

[gunsch, 2015/04/30 15:50:38]

This interface probably lives better somewhere like CastContentBrowserClient,
such as:

::media::AudioManagerFactory*
CastContentBrowserClient::GetPlatformAudioManagerFactory()

+}
+
 namespace shell {
 
 namespace {
 
 struct DefaultCommandLineSwitch {
   const char* const switch_name;
   const char* const switch_value;
 };
 
 DefaultCommandLineSwitch g_default_switches[] = {
@@ skipping 52 matching lines @@
 }
 
 void CastBrowserMainParts::PreMainMessageLoopStart() {
   // GroupedHistograms needs to be initialized before any threads are created
   // to prevent race conditions between calls to Preregister and those threads
   // attempting to collect metrics.
   // This call must also be before NetworkChangeNotifier, as it generates
   // Net/DNS metrics.
   metrics::PreregisterAllGroupedHistograms();
 
+  // Set the platform's implementation of AudioManager factory.
+  ::chromecast::media::SetPlatformAudioManagerFactory();
+
 #if defined(OS_ANDROID)
   net::NetworkChangeNotifier::SetFactory(
       new net::NetworkChangeNotifierFactoryAndroid());
 #endif  // defined(OS_ANDROID)
 }
 
 void CastBrowserMainParts::PostMainMessageLoopStart() {
   cast_browser_process_->SetMetricsHelper(make_scoped_ptr(
       new metrics::CastMetricsHelper(base::MessageLoopProxy::current())));
 
@@ skipping 120 matching lines @@
 #else
   cast_browser_process_->cast_service()->Finalize();
   cast_browser_process_->metrics_service_client()->Finalize();
   cast_browser_process_.reset();
   DeregisterKillOnAlarm();
 #endif
 }
 
 }  // namespace shell
 }  // namespace chromecast