Link MediaSessionTabHelper with native MediaSession [CL is going to be split]

content/browser/android/browser_jni_registrar.cc

Index: content/browser/android/browser_jni_registrar.cc
diff --git a/content/browser/android/browser_jni_registrar.cc b/content/browser/android/browser_jni_registrar.cc
index 32dfc1042175dd3e5a5f4dd80846f148929c582e..891910c0b77f408a8b1c8f1bc288958c62ecffb9 100644
--- a/content/browser/android/browser_jni_registrar.cc
+++ b/content/browser/android/browser_jni_registrar.cc
@@ -25,6 +25,7 @@
 #include "content/browser/device_sensors/sensor_manager_android.h"
 #include "content/browser/frame_host/navigation_controller_android.h"
 #include "content/browser/media/session/audio_focus_delegate_android.h"
+#include "content/browser/media/session/media_session_android.h"
 #include "content/browser/memory/memory_monitor_android.h"
 #include "content/browser/renderer_host/ime_adapter_android.h"
 #include "content/browser/speech/speech_recognizer_impl_android.h"
@@ -38,6 +39,7 @@ base::android::RegistrationMethod kContentRegisteredMethods[] = {
     {"AudioFocusDelegate", content::AudioFocusDelegateAndroid::Register},
     {"BrowserStartupController", content::RegisterBrowserStartupController},
     {"ChildProcessLauncher", content::RegisterChildProcessLauncher},
+    {"ChromeMediaSession", content::MediaSessionAndroid::Register},
     {"ContentVideoView", content::ContentVideoView::RegisterContentVideoView},
     {"CoreImpl", mojo::android::RegisterCoreImpl},
     {"MemoryMonitorAndroid", content::MemoryMonitorAndroid::Register},