Add HDR Metadata extension

Basic framework to support HDR Metadata extension. Will
add system plumbing in separate CL.

Test: CTS dEQP-VK.wsi.android.hdr_metadata.scale_none.fifo.*
Change-Id: I5de639ef87a988e02d194a2bd91d16ffe6102c6e
diff --git a/vulkan/libvulkan/swapchain.cpp b/vulkan/libvulkan/swapchain.cpp
index 9630ac9..b1e3d61 100644
--- a/vulkan/libvulkan/swapchain.cpp
+++ b/vulkan/libvulkan/swapchain.cpp
@@ -1351,5 +1351,18 @@
     return result;
 }
 
+VKAPI_ATTR void SetHdrMetadataEXT(
+    VkDevice device,
+    uint32_t swapchainCount,
+    const VkSwapchainKHR* pSwapchains,
+    const VkHdrMetadataEXT* pHdrMetadataEXTs) {
+    // TODO: courtneygo: implement actual function
+    (void)device;
+    (void)swapchainCount;
+    (void)pSwapchains;
+    (void)pHdrMetadataEXTs;
+    return;
+}
+
 }  // namespace driver
 }  // namespace vulkan