Pass actual present time to ViewRootImpl

To measure end-to-end touch latency, we need to report the actual
present time to ViewRootImpl. ViewRootImpl, in turn, will report this
information to InputDispatcher. Finally, InputDispatcher will combine
all known information for a specific input event, and will report this
data to westworld.

In another patch, we will add a new call, 'reportLatencyInfo', to
InputPublisher. This call will allow the app to send this latency data
to InputDispatcher.

Bug: 169866723
Test: printed the input event present times inside ViewRootImpl
Change-Id: Ibd3a2cfeb1a340eb15cd2165071df1f8589634af

1 files changed, 10 insertions, 0 deletions

diff --git a/core/java/android/view/InputEventReceiver.java b/core/java/android/view/InputEventReceiver.java
index 7d1adc36964b..79d8c14aa0df 100644
--- a/core/java/android/view/InputEventReceiver.java
+++ b/core/java/android/view/InputEventReceiver.java
@@ -21,6 +21,7 @@ import android.os.Build;
 import android.os.IBinder;
 import android.os.Looper;
 import android.os.MessageQueue;
+import android.os.Trace;
 import android.util.Log;
 import android.util.SparseIntArray;
 
@@ -198,6 +199,15 @@ public abstract class InputEventReceiver {
     }
 
     /**
+     * Report the latency information for a specific input event.
+     */
+    public final void reportLatencyInfo(int inputEventId, long gpuCompletedTime, long presentTime) {
+        Trace.traceBegin(Trace.TRACE_TAG_INPUT, "reportLatencyInfo");
+        // TODO(b/169866723) : send this data to InputDispatcher via InputChannel
+        Trace.traceEnd(Trace.TRACE_TAG_INPUT);
+    }
+
+    /**
      * Consumes all pending batched input events.
      * Must be called on the same Looper thread to which the receiver is attached.
      *