Add flag for migrating transition tracing to Perfetto

Bug: 309630341

Test: Test: adb shell device_config put windowing_tools android.tracing.perfetto_transition_tracing true
Change-Id: Ie299a3b2c86d22661b6156ad9bcee7b20328fabb

AconfigFlags.bp

@@ -62,6 +62,7 @@ aconfig_srcjars = [
     ":surfaceflinger_flags_java_lib{.generated_srcjars}",
     ":android.view.contentcapture.flags-aconfig-java{.generated_srcjars}",
     ":android.hardware.usb.flags-aconfig-java{.generated_srcjars}",
+    ":android.tracing.flags-aconfig-java{.generated_srcjars}",
 ]
 
 filegroup {
@@ -695,3 +696,16 @@ java_aconfig_library {
     aconfig_declarations: "android.hardware.usb.flags-aconfig",
     defaults: ["framework-minus-apex-aconfig-java-defaults"],
 }
+
+// WindowingTools
+aconfig_declarations {
+    name: "android.tracing.flags-aconfig",
+    package: "android.tracing",
+    srcs: ["core/java/android/tracing/flags.aconfig"],
+}
+
+java_aconfig_library {
+    name: "android.tracing.flags-aconfig-java",
+    aconfig_declarations: "android.tracing.flags-aconfig",
+    defaults: ["framework-minus-apex-aconfig-java-defaults"],
+}

core/java/android/tracing/flags.aconfig

+package: "android.tracing"
+
+flag {
+    name: "perfetto_transition_tracing"
+    namespace: "windowing_tools"
+    description: "Move transition tracing to Perfetto"
+    bug: "309630341"
+}
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