Merge "Vulkan: Work-around Android start-up race condition" am: 9d98433a

    VkResult result = EnumerateDeviceExtensionProperties(physical_dev, nullptr,

                                                         &count, nullptr);

    if (result == VK_SUCCESS && count) {

        // Work-around a race condition during Android start-up, that can result

        // in the second call to EnumerateDeviceExtensionProperties having

        // another extension.  That causes the second call to return

        // VK_INCOMPLETE.  A work-around is to add 1 to "count" and ask for one

        // more extension property.  See: http://anglebug.com/6715 and

        // internal-to-Google b/206733351.

        count++;

        driver_extensions_ = AllocateDriverExtensionArray(count);

        result = (driver_extensions_)

                     ? EnumerateDeviceExtensionProperties(