Add a hidden API to set trace tag on atrace counters.

Currently the only counter API on trace uses the APP tag. Add a new
(hidden) API that will allow the system to set counters with different
tags.

Bug: 358369221
Flag: EXEMPT - adding hidden API only with no usage yet
Test: Try to add a counter with TRACE_TAG_WINDOW_MANAGER and check trace
Change-Id: I874d60998a26b7a80ac93b0a5e70ffddcaa9197c

1 files changed, 14 insertions, 2 deletions

diff --git a/core/java/android/os/Trace.java b/core/java/android/os/Trace.java
index edb3a641f107..4a37e0a70443 100644
--- a/core/java/android/os/Trace.java
+++ b/core/java/android/os/Trace.java
@@ -520,8 +520,20 @@ public final class Trace {
      * @param counterValue The counter value.
      */
     public static void setCounter(@NonNull String counterName, long counterValue) {
-        if (isTagEnabled(TRACE_TAG_APP)) {
-            nativeTraceCounter(TRACE_TAG_APP, counterName, counterValue);
+        setCounter(TRACE_TAG_APP, counterName, counterValue);
+    }
+
+    /**
+     * Writes trace message to indicate the value of a given counter under a given trace tag.
+     *
+     * @param traceTag The trace tag.
+     * @param counterName The counter name to appear in the trace.
+     * @param counterValue The counter value.
+     * @hide
+     */
+    public static void setCounter(long traceTag, @NonNull String counterName, long counterValue) {
+        if (isTagEnabled(traceTag)) {
+            nativeTraceCounter(traceTag, counterName, counterValue);
         }
     }