Add logs for the ungaze gesture.

-We add logs to track how much screen time we save with the ungaze feature.

Change-Id: I02bce959ce7ed5bc6c848e51256063c946ff3e87

services/core/java/com/android/server/EventLogTags.logtags

@@ -29,6 +29,9 @@ option java_package com.android.server
 # This is logged when the partial wake lock (keeping the device awake
 # regardless of whether the screen is off) is acquired or released.
 2729 power_partial_wake_state (releasedorAcquired|1|5),(tag|3)
+# The device is being asked to go into a soft sleep (typically by the ungaze gesture).
+# It logs the time remaining before the device would've normally gone to sleep without the request.
+2731 power_soft_sleep_requested (savedwaketimems|2)
 
 #
 # Leave IDs through 2739 for more power logs (2730 used by battery_discharge above)

services/core/java/com/android/server/power/PowerManagerService.java

@@ -1577,6 +1577,13 @@ public final class PowerManagerService extends SystemService
                 }
 
                 if (mUserActivitySummary != USER_ACTIVITY_SCREEN_DREAM && userInactiveOverride) {
+                    if ((mUserActivitySummary &
+                            (USER_ACTIVITY_SCREEN_BRIGHT | USER_ACTIVITY_SCREEN_DIM)) != 0) {
+                      // Device is being kept awake by recent user activity
+                      long savedWakeTimeMs = now - nextTimeout;
+                      EventLog.writeEvent(
+                              EventLogTags.POWER_SOFT_SLEEP_REQUESTED, savedWakeTimeMs);
+                    }
                     mUserActivitySummary = USER_ACTIVITY_SCREEN_DREAM;
                     nextTimeout = -1;
                 }