Create flag for enabling layout tracing in SystemUI

Flag: ACONFIG enable_layout_tracing DISABLED
Bug: 315274804
Test: perfetto trace
Change-Id: I8626536a95b9e9febbe3744f53765f61cd6f4859

2 files changed, 11 insertions, 0 deletions

diff --git a/packages/SystemUI/aconfig/systemui.aconfig b/packages/SystemUI/aconfig/systemui.aconfig
index c52a89c9b05e..086ec2438223 100644
--- a/packages/SystemUI/aconfig/systemui.aconfig
+++ b/packages/SystemUI/aconfig/systemui.aconfig
@@ -204,6 +204,13 @@ flag {
 }
 
 flag {
+  name: "enable_layout_tracing"
+  namespace: "systemui"
+  description: "Enables detailed traversal slices during measure and layout in perfetto traces"
+  bug: "315274804"
+}
+
+flag {
    name: "quick_settings_visual_haptics_longpress"
    namespace: "systemui"
    description: "Enable special visual and haptic effects for quick settings tiles with long-press actions"
diff --git a/packages/SystemUI/src/com/android/systemui/SystemUIApplication.java b/packages/SystemUI/src/com/android/systemui/SystemUIApplication.java
index bf445177f3f8..c3f64803758b 100644
--- a/packages/SystemUI/src/com/android/systemui/SystemUIApplication.java
+++ b/packages/SystemUI/src/com/android/systemui/SystemUIApplication.java
@@ -110,6 +110,10 @@ public class SystemUIApplication extends Application implements
         View.setTracedRequestLayoutClassClass(
                 SystemProperties.get("persist.debug.trace_request_layout_class", null));
 
+        if (Flags.enableLayoutTracing()) {
+            View.setTraceLayoutSteps(true);
+        }
+
         if (Process.myUserHandle().equals(UserHandle.SYSTEM)) {
             IntentFilter bootCompletedFilter = new
                     IntentFilter(Intent.ACTION_LOCKED_BOOT_COMPLETED);