diff --git a/cmds/statsd/src/atoms.proto b/cmds/statsd/src/atoms.proto
index 8637b79..7f77ef7 100644
--- a/cmds/statsd/src/atoms.proto
+++ b/cmds/statsd/src/atoms.proto
@@ -81,6 +81,9 @@
         DropboxErrorChanged dropbox_error_changed = 45;
         AnomalyDetected anomaly_detected = 46;
         AppHook app_hook = 47;
+        AppStartChanged app_start_changed = 48;
+        AppStartCancelChanged app_start_cancel_changed = 49;
+        AppStartFullyDrawnChanged app_start_fully_drawn_changed = 50;
         // TODO: Reorder the numbering so that the most frequent occur events occur in the first 15.
     }
 
@@ -855,6 +858,100 @@
     optional int64 alert_id = 3;
 }
 
+message AppStartChanged {
+    // The uid if available. -1 means not available.
+    optional int32 uid = 1;
+
+    // The app package name.
+    optional string pkg_name = 2;
+
+    enum TransitionType {
+        APP_START_TRANSITION_TYPE_UNKNOWN = 0;
+        WARM = 1;
+        HOT = 2;
+        COLD = 3;
+    }
+    // The transition type.
+    optional TransitionType type = 3;
+
+    // The activity name.
+    optional string activity_name = 4;
+
+    // The name of the calling app. Empty if not set.
+    optional string calling_pkg_name = 5;
+
+    // Whether the app is an instant app.
+    optional bool is_instant_app = 6;
+
+    // Device uptime when activity started.
+    optional int64 activity_start_msec = 7;
+
+    // TODO: Update android/app/ActivityManagerInternal.java constants to depend on our proto enum.
+    enum TransitionReason {
+        APP_START_TRANSITION_REASON_UNKNOWN = 0;
+        SPLASH_SCREEN = 1;
+        WINDOWS_DRAWN = 2;
+        TIMEOUT = 3;
+        SNAPSHOT = 4;
+    }
+    optional TransitionReason reason = 8;
+
+    optional int32 transition_delay_msec = 9;
+    // -1 if not set.
+    optional int32 starting_window_delay_msec = 10;
+    // -1 if not set.
+    optional int32 bind_application_delay_msec = 11;
+    optional int32 windows_drawn_delay_msec = 12;
+
+    // Empty if not set.
+    optional string launch_token = 13;
+
+}
+
+message AppStartCancelChanged {
+    // The uid if available. -1 means not available.
+    optional int32 uid = 1;
+
+    // The app package name.
+    optional string pkg_name = 2;
+
+    enum TransitionType {
+        APP_START_TRANSITION_TYPE_UNKNOWN = 0;
+        WARM = 1;
+        HOT = 2;
+        COLD = 3;
+    }
+    // The transition type.
+    optional TransitionType type = 3;
+
+    // The activity name.
+    optional string activity_name = 4;
+}
+
+message AppStartFullyDrawnChanged {
+    // The uid if available. -1 means not available.
+    optional int32 uid = 1;
+
+    // The app package name.
+    optional string pkg_name = 2;
+
+    enum TransitionType {
+        APP_START_TRANSITION_TYPE_UNKNOWN = 0;
+        WITH_BUNDLE = 1;
+        WITHOUT_BUNDLE = 2;
+    }
+    // The transition type.
+    optional TransitionType type = 3;
+
+    // The activity name.
+    optional string activity_name = 4;
+
+    optional bool transition_process_running = 5;
+
+    // App startup time (until call to Activity#reportFullyDrawn()).
+    optional int64 app_startup_time_ms = 6;
+}
+
 /**
  * Pulls bytes transferred via wifi (Sum of foreground and background usage).
  *
diff --git a/services/core/java/com/android/server/am/ActivityMetricsLogger.java b/services/core/java/com/android/server/am/ActivityMetricsLogger.java
index eb022b7..66f0592 100644
--- a/services/core/java/com/android/server/am/ActivityMetricsLogger.java
+++ b/services/core/java/com/android/server/am/ActivityMetricsLogger.java
@@ -42,6 +42,7 @@
 import android.util.Slog;
 import android.util.SparseArray;
 import android.util.SparseIntArray;
+import android.util.StatsLog;
 
 import com.android.internal.logging.MetricsLogger;
 import com.android.internal.os.SomeArgs;
@@ -431,6 +432,12 @@
         builder.setType(type);
         builder.addTaggedData(FIELD_CLASS_NAME, info.launchedActivity.info.name);
         mMetricsLogger.write(builder);
+        StatsLog.write(
+                StatsLog.APP_START_CANCEL_CHANGED,
+                info.launchedActivity.appInfo.uid,
+                info.launchedActivity.packageName,
+                convertAppStartTransitionType(type),
+                info.launchedActivity.info.name);
     }
 
     private void logAppTransitionMultiEvents() {
@@ -450,9 +457,9 @@
                 builder.addTaggedData(APP_TRANSITION_CALLING_PACKAGE_NAME,
                         info.launchedActivity.launchedFromPackage);
             }
-            if (info.launchedActivity.info.launchToken != null) {
-                builder.addTaggedData(FIELD_INSTANT_APP_LAUNCH_TOKEN,
-                        info.launchedActivity.info.launchToken);
+            String launchToken = info.launchedActivity.info.launchToken;
+            if (launchToken != null) {
+                builder.addTaggedData(FIELD_INSTANT_APP_LAUNCH_TOKEN, launchToken);
                 info.launchedActivity.info.launchToken = null;
             }
             builder.addTaggedData(APP_TRANSITION_IS_EPHEMERAL, isInstantApp ? 1 : 0);
@@ -470,9 +477,37 @@
             }
             builder.addTaggedData(APP_TRANSITION_WINDOWS_DRAWN_DELAY_MS, info.windowsDrawnDelayMs);
             mMetricsLogger.write(builder);
+            StatsLog.write(
+                    StatsLog.APP_START_CHANGED,
+                    info.launchedActivity.appInfo.uid,
+                    info.launchedActivity.packageName,
+                    convertAppStartTransitionType(type),
+                    info.launchedActivity.info.name,
+                    info.launchedActivity.launchedFromPackage,
+                    isInstantApp,
+                    mCurrentTransitionDeviceUptime * 1000,
+                    info.reason,
+                    mCurrentTransitionDelayMs,
+                    info.startingWindowDelayMs,
+                    info.bindApplicationDelayMs,
+                    info.windowsDrawnDelayMs,
+                    launchToken);
         }
     }
 
+    private int convertAppStartTransitionType(int tronType) {
+        if (tronType == TYPE_TRANSITION_COLD_LAUNCH) {
+            return StatsLog.APP_START_CHANGED__TYPE__COLD;
+        }
+        if (tronType == TYPE_TRANSITION_WARM_LAUNCH) {
+            return StatsLog.APP_START_CHANGED__TYPE__WARM;
+        }
+        if (tronType == TYPE_TRANSITION_HOT_LAUNCH) {
+            return StatsLog.APP_START_CHANGED__TYPE__HOT;
+        }
+        return StatsLog.APP_START_CHANGED__TYPE__APP_START_TRANSITION_TYPE_UNKNOWN;
+     }
+
     void logAppTransitionReportedDrawn(ActivityRecord r, boolean restoredFromBundle) {
         final StackTransitionInfo info = mLastStackTransitionInfo.get(r.getStackId());
         if (info == null) {
@@ -481,14 +516,24 @@
         final LogMaker builder = new LogMaker(APP_TRANSITION_REPORTED_DRAWN);
         builder.setPackageName(r.packageName);
         builder.addTaggedData(FIELD_CLASS_NAME, r.info.name);
-        builder.addTaggedData(APP_TRANSITION_REPORTED_DRAWN_MS,
-                SystemClock.uptimeMillis() - mLastTransitionStartTime);
+        long startupTimeMs = SystemClock.uptimeMillis() - mLastTransitionStartTime;
+        builder.addTaggedData(APP_TRANSITION_REPORTED_DRAWN_MS, startupTimeMs);
         builder.setType(restoredFromBundle
                 ? TYPE_TRANSITION_REPORTED_DRAWN_WITH_BUNDLE
                 : TYPE_TRANSITION_REPORTED_DRAWN_NO_BUNDLE);
         builder.addTaggedData(APP_TRANSITION_PROCESS_RUNNING,
                 info.currentTransitionProcessRunning ? 1 : 0);
         mMetricsLogger.write(builder);
+        StatsLog.write(
+                StatsLog.APP_START_FULLY_DRAWN_CHANGED,
+                info.launchedActivity.appInfo.uid,
+                info.launchedActivity.packageName,
+                restoredFromBundle
+                        ? StatsLog.APP_START_FULLY_DRAWN_CHANGED__TYPE__WITH_BUNDLE
+                        : StatsLog.APP_START_FULLY_DRAWN_CHANGED__TYPE__WITHOUT_BUNDLE,
+                info.launchedActivity.info.name,
+                info.currentTransitionProcessRunning,
+                startupTimeMs);
     }
 
     private int getTransitionType(StackTransitionInfo info) {