Advertise support for BT709 in the WSI

Bug: 203533233
Test: build
Change-Id: Ie858995e7d5ef7be481f275450372bd319746e18
diff --git a/vulkan/libvulkan/swapchain.cpp b/vulkan/libvulkan/swapchain.cpp
index 3ed3eba..e89a49b 100644
--- a/vulkan/libvulkan/swapchain.cpp
+++ b/vulkan/libvulkan/swapchain.cpp
@@ -736,7 +736,8 @@
     // We must support R8G8B8A8
     std::vector<VkSurfaceFormatKHR> all_formats = {
         {VK_FORMAT_R8G8B8A8_UNORM, VK_COLOR_SPACE_SRGB_NONLINEAR_KHR},
-        {VK_FORMAT_R8G8B8A8_SRGB, VK_COLOR_SPACE_SRGB_NONLINEAR_KHR}};
+        {VK_FORMAT_R8G8B8A8_SRGB, VK_COLOR_SPACE_SRGB_NONLINEAR_KHR},
+        {VK_FORMAT_R8G8B8A8_UNORM, VK_COLOR_SPACE_BT709_LINEAR_EXT}};
 
     if (wide_color_support) {
         all_formats.emplace_back(VkSurfaceFormatKHR{