No issue - add API to tell Profile Timeline Recording state to JS engine

Based-on: m-c 1342070/5

js/src/jsapi.cpp

@@ -1276,6 +1276,20 @@ JS::detail::ComputeThis(JSContext* cx, Value* vp)
     return thisv;
 }
 
+static bool gProfileTimelineRecordingEnabled = false;
+
+JS_PUBLIC_API(void)
+JS::SetProfileTimelineRecordingEnabled(bool enabled)
+{
+    gProfileTimelineRecordingEnabled = enabled;
+}
+
+JS_PUBLIC_API(bool)
+JS::IsProfileTimelineRecordingEnabled()
+{
+    return gProfileTimelineRecordingEnabled;
+}
+
 JS_PUBLIC_API(void*)
 JS_malloc(JSContext* cx, size_t nbytes)
 {

js/src/jsapi.h

@@ -1545,6 +1545,22 @@ JS_DefineProfilingFunctions(JSContext* cx, JS::HandleObject obj);
 extern JS_PUBLIC_API(bool)
 JS_DefineDebuggerObject(JSContext* cx, JS::HandleObject obj);
 
+namespace JS {
+
+/**
+ * Tell JS engine whether Profile Timeline Recording is enabled or not.
+ * If Profile Timeline Recording is enabled, data shown there like stack won't
+ * be optimized out.
+ * This is global state and not associated with specific runtime or context.
+ */
+extern JS_PUBLIC_API(void)
+SetProfileTimelineRecordingEnabled(bool enabled);
+
+extern JS_PUBLIC_API(bool)
+IsProfileTimelineRecordingEnabled();
+
+} // namespace JS
+
 #ifdef JS_HAS_CTYPES
 /**
  * Initialize the 'ctypes' object on a global variable 'obj'. The 'ctypes'