AOD: Skip prox check if cached prox value available

On AOD, we run the proximity sensor, so when a pulse comes in,
there is no need to wait for a new result. Instead, we can use
the existing value if available.

Change-Id: Ibded081e5011a3053e6990012f97f63865e20298
Fixes: 63538693
Test: receive notification, verify that pulsing starts immediately and does not wait for the proximity check.

packages/SystemUI/src/com/android/systemui/doze/DozeSensors.java

@@ -184,6 +184,13 @@ public class DozeSensors {
         pw.print("ProxSensor: "); pw.println(mProxSensor.toString());
     }
 
+    /**
+     * @return true if prox is currently far, false if near or null if unknown.
+     */
+    public Boolean isProximityCurrentlyFar() {
+        return mProxSensor.mCurrentlyFar;
+    }
+
     private class ProxSensor implements SensorEventListener {
 
         static final long COOLDOWN_TRIGGER = 2 * 1000;

packages/SystemUI/src/com/android/systemui/doze/DozeTriggers.java

@@ -103,8 +103,11 @@ public class DozeTriggers implements DozeMachine.Part {
     private void proximityCheckThenCall(IntConsumer callback,
             boolean alreadyPerformedProxCheck,
             int pulseReason) {
+        Boolean cachedProxFar = mDozeSensors.isProximityCurrentlyFar();
         if (alreadyPerformedProxCheck) {
             callback.accept(ProximityCheck.RESULT_NOT_CHECKED);
+        } else if (cachedProxFar != null) {
+            callback.accept(cachedProxFar ? ProximityCheck.RESULT_FAR : ProximityCheck.RESULT_NEAR);
         } else {
             final long start = SystemClock.uptimeMillis();
             new ProximityCheck() {