add launch performance test for messaging app

this is part of the effort for collecting app launch time for the platform

Change-Id: I757548dd605334781d55ac88934034aaa425ce92

tests/AndroidManifest.xml

@@ -34,4 +34,7 @@
                      android:targetPackage="com.android.mms"
                      android:label="Tests for Mms."/>
 
+    <instrumentation android:name="com.android.mms.MmsLaunchPerformance"
+                     android:targetPackage="com.android.mms"
+                     android:label="Mms Launch Performance Test"/>
 </manifest>

tests/src/com/android/mms/MmsLaunchPerformance.java

@@ -0,0 +1,29 @@
+package com.android.mms;
+
+import android.app.Activity;
+import android.content.Intent;
+import android.os.Bundle;
+import android.test.LaunchPerformanceBase;
+
+public class MmsLaunchPerformance extends LaunchPerformanceBase {
+
+    @Override
+    public void onCreate(Bundle arguments) {
+        super.onCreate(arguments);
+
+        mIntent.setPackage(getTargetContext().getPackageName());
+        mIntent.setAction(Intent.ACTION_MAIN);
+        start();
+    }
+
+    /**
+     * Calls LaunchApp and finish.
+     */
+    @Override
+    public void onStart() {
+        super.onStart();
+        LaunchApp();
+        finish(Activity.RESULT_OK, mResults);
+    }
+
+}