Mac AVFoundation/QTKit: delay DeviceMonitorMac startup to first GetUserMedia.

content/browser/browser_main_loop.cc

 // Copyright (c) 2012 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 "content/browser/browser_main_loop.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/debug/trace_event.h"
 #include "base/file_util.h"
@@ skipping 891 matching lines @@
     URLDataManager::DeleteDataSources();
   }
 #endif  // !defined(OS_IOS)
 
   if (parts_) {
     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:PostDestroyThreads");
     parts_->PostDestroyThreads();
   }
 }
 
+#if defined(OS_MACOSX) && !defined(OS_IOS)
+void BrowserMainLoop::StartMonitoring() {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  device_monitor_mac_->StartMonitoring();
+}
+#endif
+
 void BrowserMainLoop::InitializeMainThread() {
   TRACE_EVENT0("startup", "BrowserMainLoop::InitializeMainThread")
   const char* kThreadName = "CrBrowserMain";
   base::PlatformThread::SetName(kThreadName);
   if (main_message_loop_)
     main_message_loop_->set_thread_name(kThreadName);
 
   // Register the main thread by instantiating it, but don't call any methods.
   main_thread_.reset(
       new BrowserThreadImpl(BrowserThread::UI, base::MessageLoop::current()));
@@ skipping 202 matching lines @@
       base::TimeDelta::FromSeconds(delay_secs));
 }
 
 void BrowserMainLoop::EndStartupTracing(const base::FilePath& trace_file) {
   is_tracing_startup_ = false;
   TracingController::GetInstance()->DisableRecording(
       trace_file, TracingController::TracingFileResultCallback());
 }
 
 }  // namespace content