use min app launch time in AppLaunch perf test

Change-Id: Id3a5872ff29fba5daeff058f0842fd011e50a0a1
diff --git a/tests/AppLaunch/src/com/android/tests/applaunch/AppLaunch.java b/tests/AppLaunch/src/com/android/tests/applaunch/AppLaunch.java
index 62f6aff..dfb8070 100644
--- a/tests/AppLaunch/src/com/android/tests/applaunch/AppLaunch.java
+++ b/tests/AppLaunch/src/com/android/tests/applaunch/AppLaunch.java
@@ -85,11 +85,13 @@
         // do initial app launch, without force stopping
         for (String app : mNameToResultKey.keySet()) {
             long launchTime = startApp(app, false);
-            if (launchTime <=0 ) {
+            if (launchTime <= 0) {
                 mNameToLaunchTime.put(app, -1L);
                 // simply pass the app if launch isn't successful
                 // error should have already been logged by startApp
                 continue;
+            } else {
+                mNameToLaunchTime.put(app, launchTime);
             }
             sleep(INITIAL_LAUNCH_IDLE_TIMEOUT);
             closeApp(app, false);
@@ -98,9 +100,9 @@
         // do the real app launch now
         for (int i = 0; i < mLaunchIterations; i++) {
             for (String app : mNameToResultKey.keySet()) {
-                long totalLaunchTime = mNameToLaunchTime.get(app);
+                long prevLaunchTime = mNameToLaunchTime.get(app);
                 long launchTime = 0;
-                if (totalLaunchTime < 0) {
+                if (prevLaunchTime < 0) {
                     // skip if the app has previous failures
                     continue;
                 }
@@ -110,18 +112,19 @@
                     mNameToLaunchTime.put(app, -1L);
                     continue;
                 }
-                totalLaunchTime += launchTime;
-                mNameToLaunchTime.put(app, totalLaunchTime);
+                // keep the min launch time
+                if (launchTime < prevLaunchTime) {
+                    mNameToLaunchTime.put(app, launchTime);
+                }
                 sleep(POST_LAUNCH_IDLE_TIMEOUT);
                 closeApp(app, true);
                 sleep(BETWEEN_LAUNCH_SLEEP_TIMEOUT);
             }
         }
         for (String app : mNameToResultKey.keySet()) {
-            long totalLaunchTime = mNameToLaunchTime.get(app);
-            if (totalLaunchTime != -1) {
-                mResult.putDouble(mNameToResultKey.get(app),
-                        ((double) totalLaunchTime) / mLaunchIterations);
+            long launchTime = mNameToLaunchTime.get(app);
+            if (launchTime != -1) {
+                mResult.putLong(mNameToResultKey.get(app), launchTime);
             }
         }
         instrumentation.sendStatus(0, mResult);