Add package_name to log for debugging the back gesture model.

Test: manual.
Bug: 150170384
Change-Id: I94efa3ec6af62b485c45f9bf17861722b73ecca3
Merged-In: I94efa3ec6af62b485c45f9bf17861722b73ecca3
diff --git a/cmds/statsd/src/atoms.proto b/cmds/statsd/src/atoms.proto
index 0c1c577..2bc1531 100644
--- a/cmds/statsd/src/atoms.proto
+++ b/cmds/statsd/src/atoms.proto
@@ -3038,8 +3038,9 @@
     optional int32 end_y = 7;  // Y coordinate for ACTION_MOVE event.
     optional int32 left_boundary = 8;  // left edge width + left inset
     optional int32 right_boundary = 9;  // screen width - (right edge width + right inset)
-    optional float ml_model_score = 10;  // The score between 0 and 1 which is the prediction output
-        // for the Back Gesture model.
+    // The score between 0 and 1 which is the prediction output for the Back Gesture model.
+    optional float ml_model_score = 10;
+    optional string package_name = 11;  // The name of the top 100 most used package by all users.
 
     enum WindowHorizontalLocation {
         DEFAULT_LOCATION = 0;
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/phone/EdgeBackGestureHandler.java b/packages/SystemUI/src/com/android/systemui/statusbar/phone/EdgeBackGestureHandler.java
index ad071c8..3271abe 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/phone/EdgeBackGestureHandler.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/phone/EdgeBackGestureHandler.java
@@ -592,6 +592,11 @@
             return;
         }
         mLogGesture = false;
+        String logPackageName = "";
+        // Due to privacy, only top 100 most used apps by all users can be logged.
+        if (mUseMLModel && mVocab.containsKey(mPackageName) && mVocab.get(mPackageName) < 100) {
+            logPackageName = mPackageName;
+        }
         SysUiStatsLog.write(SysUiStatsLog.BACK_GESTURE_REPORTED_REPORTED, backType,
                 (int) mDownPoint.y, mIsOnLeftEdge
                         ? SysUiStatsLog.BACK_GESTURE__X_LOCATION__LEFT
@@ -600,7 +605,7 @@
                 (int) mEndPoint.x, (int) mEndPoint.y,
                 mEdgeWidthLeft + mLeftInset,
                 mDisplaySize.x - (mEdgeWidthRight + mRightInset),
-                mUseMLModel ? mMLResults : -2);
+                mUseMLModel ? mMLResults : -2, logPackageName);
     }
 
     private void onMotionEvent(MotionEvent ev) {