Merge "swapchain: Fix SHARED presentation modes" am: fbc8aaa8

        swap_interval ? create_info->minImageCount : mailbox_num_images;

    uint32_t num_images = requested_images - 1 + min_undequeued_buffers;

    // Lower layer insists that we have at least two buffers. This is wasteful

    // and we'd like to relax it in the shared case, but not all the pieces are

    // in place for that to work yet. Note we only lie to the lower layer-- we

    // don't want to give the app back a swapchain with extra images (which they

    // can't actually use!).

    err = native_window_set_buffer_count(window, std::max(2u, num_images));

    // Lower layer insists that we have at least min_undequeued_buffers + 1

    // buffers.  This is wasteful and we'd like to relax it in the shared case,

    // but not all the pieces are in place for that to work yet.  Note we only

    // lie to the lower layer--we don't want to give the app back a swapchain

    // with extra images (which they can't actually use!).

    uint32_t min_buffer_count = min_undequeued_buffers + 1;

    err = native_window_set_buffer_count(

        window, std::max(min_buffer_count, num_images));

    if (err != android::OK) {

        ALOGE("native_window_set_buffer_count(%d) failed: %s (%d)", num_images,

              strerror(-err), err);