Merge "Binder: avoid GC while holding lock" into main

{

public:

    sp<JavaBBinder> get(JNIEnv* env, jobject obj)

    {

        sp<JavaBBinder> b;

        {

            AutoMutex _l(mLock);

        sp<JavaBBinder> b = mBinder.promote();

        if (b == NULL) {

            // must take lock to promote because we set the same wp<>

            // on another thread.

            b = mBinder.promote();

        }

        if (b) return b;

        // b/360067751: constructor may trigger GC, so call outside lock

        b = new JavaBBinder(env, obj);

        {

            AutoMutex _l(mLock);

            // if it was constructed on another thread in the meantime,

            // return that. 'b' will just get destructed.

            if (sp<JavaBBinder> b2 = mBinder.promote(); b2) return b2;

            if (mVintf) {

                ::android::internal::Stability::markVintf(b.get());

            }