call wr_profiler_set_enabled() on compositor thread r=nical

gfx/layers/wr/WebRenderBridgeParent.cpp

@@ -801,7 +801,17 @@ WebRenderBridgeParent::SetWebRenderProfilerEnabled(bool aEnabled)
     if (MOZ_USE_RENDER_THREAD) {
       mApi->SetProfilerEnabled(aEnabled);
     } else {
-      wr_profiler_set_enabled(mWRWindowState, aEnabled);
+      if (CompositorThreadHolder::IsInCompositorThread()) {
+        wr_profiler_set_enabled(mWRWindowState, aEnabled);
+      } else {
+        bool enabled = aEnabled;
+        WrWindowState* state = mWRWindowState;
+        RefPtr<Runnable> runnable =
+          NS_NewRunnableFunction([state, enabled]() {
+          wr_profiler_set_enabled(state, enabled);
+        });
+        CompositorThreadHolder::Loop()->PostTask(runnable.forget());
+      }
     }
   }
 }