Add media.log to Watchdog stacks

Needed for debugging after mediaserver split.

Bug: 27408518
Change-Id: I412575264e813688396835f4f3501f6132432960
diff --git a/services/core/java/com/android/server/Watchdog.java b/services/core/java/com/android/server/Watchdog.java
index 11888ff..4198af9 100644
--- a/services/core/java/com/android/server/Watchdog.java
+++ b/services/core/java/com/android/server/Watchdog.java
@@ -67,7 +67,8 @@
         "/system/bin/audioserver",
         "/system/bin/mediaserver",
         "/system/bin/sdcard",
-        "/system/bin/surfaceflinger"
+        "/system/bin/surfaceflinger",
+        "media.log"
     };
 
     static Watchdog sWatchdog;