Merge "Fix a compile warning in the Surface class."

        // one of the buffers for which we do know the index.  This can happen

        // e.g. if GraphicBuffer is used to wrap an android_native_buffer_t that

        // was dequeued from an ANativeWindow.

        for (int i = 0; i < mBuffers.size(); i++) {

        for (size_t i = 0; i < mBuffers.size(); i++) {

            if (buffer->handle == mBuffers[i]->handle) {

                idx = mBuffers[i]->getIndex();

                break;