Merge "vulkan: Disable shared present modes for now"

    const VkPresentModeKHR kModes[] = {

        VK_PRESENT_MODE_MAILBOX_KHR, VK_PRESENT_MODE_FIFO_KHR,

        // TODO(chrisforbes): should only expose this if the driver can.

        VK_PRESENT_MODE_SHARED_DEMAND_REFRESH_KHR,

        VK_PRESENT_MODE_SHARED_CONTINUOUS_REFRESH_KHR,

        // VK_PRESENT_MODE_SHARED_DEMAND_REFRESH_KHR,

        // VK_PRESENT_MODE_SHARED_CONTINUOUS_REFRESH_KHR,

    };

    const uint32_t kNumModes = sizeof(kModes) / sizeof(kModes[0]);