Watchdog: add media.metrics

The media.metrics dump will show with an ANR, so to observe this,
one can force an ANR by stopping a key service
e.g. adb shell 'kill -STOP $(pgrep audioserver)'
and waiting a couple of minutes.

Test: adb bugreport
Bug: 71483452
Change-Id: Ie6fb2377eaecbb9e3c09f0e1b0a55c284fd4bc5f

services/core/java/com/android/server/Watchdog.java

@@ -87,6 +87,7 @@ public class Watchdog extends Thread {
         "/system/bin/sdcard",
         "/system/bin/surfaceflinger",
         "media.extractor", // system/bin/mediaextractor
+        "media.metrics", // system/bin/mediametrics
         "media.codec", // vendor/bin/hw/android.hardware.media.omx@1.0-service
         "com.android.bluetooth",  // Bluetooth service
     };