Bug 1188590: Don't sync dispatch if we're already on main. r=snorp, a=abillings

--HG--
extra : rebase_source : fdc736fac46ff2f1939d55b00407350f88345932

widget/android/AndroidJNIWrapper.cpp

@@ -55,6 +55,10 @@ extern "C" {
   __attribute__ ((visibility("default")))
   jclass
   jsjni_GetGlobalClassRef(const char *className) {
+    if (NS_IsMainThread()) {
+      return __jsjni_GetGlobalClassRef(className);
+    }
+
     nsCOMPtr<nsIThread> mainThread;
     mozilla::DebugOnly<nsresult> rv = NS_GetMainThread(getter_AddRefs(mainThread));
     MOZ_ASSERT(NS_SUCCEEDED(rv));