Bug 1372405 - Provide names for all runnables in the tree (r=froydnj)

MozReview-Commit-ID: DKR6ROiHRS7

widget/android/AndroidJNIWrapper.cpp

@@ -20,6 +20,7 @@ extern "C" {
 class GetGlobalClassRefRunnable : public mozilla::Runnable {
   public:
     GetGlobalClassRefRunnable(const char *className, jclass *foundClass) :
+        mozilla::Runnable("GetGlobalClassRefRunnable"),
         mClassName(className), mResult(foundClass) {}
     NS_IMETHOD Run() override {
         *mResult = __jsjni_GetGlobalClassRef(mClassName);