Adding MSDL history to Launcher's dump information.

The history displays the latest tokens played. Useful for testing and
debugging.

Test: presubmit
Flag: NONE MSDL playback is flagged case by case.
Bug: 377496684
Change-Id: I163889ade9fe4dee7f02459d2d9d81b94197bea1

src/com/android/launcher3/util/MSDLPlayerWrapper.java

@@ -30,6 +30,7 @@ import com.google.android.msdl.domain.InteractionProperties;
 import com.google.android.msdl.domain.MSDLPlayer;
 import com.google.android.msdl.logging.MSDLEvent;
 
+import java.io.PrintWriter;
 import java.util.List;
 
 import javax.inject.Inject;
@@ -65,4 +66,13 @@ public class MSDLPlayerWrapper {
     public List<MSDLEvent> getHistory() {
         return mMSDLPlayer.getHistory();
     }
+
+    /** Print the latest history of MSDL tokens played */
+    public void dump(String prefix, PrintWriter writer) {
+        writer.println(prefix + "MSDLPlayerWrapper history of latest events:");
+        List<MSDLEvent> events = getHistory();
+        for (MSDLEvent event: events) {
+            writer.println(prefix + "\t" + event);
+        }
+    }
 }