Initialize AVFoundation explicitly

content/browser/browser_main_loop.cc

Index: content/browser/browser_main_loop.cc
diff --git a/content/browser/browser_main_loop.cc b/content/browser/browser_main_loop.cc
index 50d0d8260023e27e578585f37344b5151a9b4a86..4436b302356d3b47b349134202c6bcab9de99608 100644
--- a/content/browser/browser_main_loop.cc
+++ b/content/browser/browser_main_loop.cc
@@ -90,6 +90,10 @@
 #include "ui/gl/gl_surface.h"
 #endif
 
+#if defined(OS_MACOSX)
+#include "media/base/mac/avfoundation_glue.h"
+#endif
+
 #if defined(OS_MACOSX) && !defined(OS_IOS)
 #include "base/memory/memory_pressure_monitor_mac.h"
 #include "content/browser/bootstrap_sandbox_mac.h"
@@ -647,6 +651,15 @@ int BrowserMainLoop::PreCreateThreads() {
   }
 #endif
 
+#if defined(OS_MACOSX)
+  {
+    // Initialize AVFoundation if supported, for audio and video.
+    TRACE_EVENT0("startup",
+                 "BrowserMainLoop::CreateThreads:InitializeAVFoundation");
+    AVFoundationGlue::InitializeAVFoundation();
+  }
+#endif
+
   // Need to initialize in-process GpuDataManager before creating threads.
   // It's unsafe to append the gpu command line switches to the global
   // CommandLine::ForCurrentProcess object after threads are created.