Add CdmService to keep track of CDMs

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 1f77258d8df738cac0a5efbef2df7b78dd3e1711..ac748e83e4f8c2ec0e8a304e624dd6a1a1d61f40 100644
--- a/content/browser/browser_main_loop.cc
+++ b/content/browser/browser_main_loop.cc
@@ -169,6 +169,10 @@
 #include "content/browser/plugin_service_impl.h"
 #endif
 
+#if defined(ENABLE_MOJO_CDM) && defined(ENABLE_PEPPER_CDMS)
+#include "content/browser/media/cdm_service_impl.h"
+#endif
+
 #if defined(USE_X11)
 #include "ui/base/x/x11_util_internal.h"
 #include "ui/gfx/x/x11_connection.h"  // nogncheck
@@ -737,6 +741,13 @@ int BrowserMainLoop::PreCreateThreads() {
   }
 #endif
 
+#if defined(ENABLE_MOJO_CDM) && defined(ENABLE_PEPPER_CDMS)
+  // Prior to any processing happening on the IO thread, we create the
+  // CDM service as it is predominantly used from the IO thread. This must
+  // be called on the main thread since it involves file path checks.
+  CdmService::GetInstance()->Init();
+#endif
+
 #if defined(OS_MACOSX)
   // The WindowResizeHelper allows the UI thread to wait on specific renderer
   // and GPU messages from the IO thread. Initializing it before the IO thread