Fork api_layer_interface.cpp for libc++ roll

The new libc++ roll requires us to add a direct include to this file.
Since it takes a while for upstream changes to roll in, fork the file
until it's fixed upstream.

The upstream change is
KhronosGroup/OpenXR-SDK-Source#554

For ease of review, the patchsets in this CL are as follows:
1 - copy the file unchanged
2 - Make the change, update the patch and build files

Note that the presubmit complained about formatting, but I wasn't able
to get `git cl format` to actually do anything.

Bug: 431755915
Change-Id: I0a42ccfbb1c95b8494d6590bf691578b82a7074a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6734768
Commit-Queue: Devon Loehr <dloehr@google.com>
Auto-Submit: Devon Loehr <dloehr@google.com>
Reviewed-by: Brandon Jones <bajones@chromium.org>
Reviewed-by: Alexander Cooper <alcooper@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1486440}

Author: DKLoehr

third_party/openxr/BUILD.gn

@@ -110,7 +110,6 @@ if (enable_openxr) {
       "src/src/common/platform_utils.hpp",
       "src/src/common/xr_dependencies.h",
       "src/src/common/xr_linear.h",
-      "src/src/loader/api_layer_interface.cpp",
       "src/src/loader/api_layer_interface.hpp",
       "src/src/loader/exception_handling.hpp",
       "src/src/loader/loader_core.cpp",
@@ -130,6 +129,7 @@ if (enable_openxr) {
       "src/src/loader/xr_generated_loader.hpp",
       "src/src/xr_generated_dispatch_table_core.c",
       "src/src/xr_generated_dispatch_table_core.h",
+      "src_overrides/src/loader/api_layer_interface.cpp",
       "src_overrides/src/loader/manifest_file.cpp",
     ]
 

third_party/openxr/README.chromium

@@ -35,6 +35,8 @@ The following changes should be reflected in `src_overrides/patches`:
 * Forked android_utilites.cpp and manifest_file.cpp to allow for customizing to
 ignore loading in Android ContentProvider supplied paths while investigating and
 waiting for upstreaming.
+* Forked api_layer_interface.cpp to unblock a libc++ roll by cherry-picking
+https://github.com/KhronosGroup/OpenXR-SDK-Source/pull/554
 
 -------------------- DEPENDENCY DIVIDER --------------------
 

third_party/openxr/src_overrides/patches/0002-Add-include.patch

@@ -0,0 +1,24 @@
+From fc81163b41f545c346ecdf34501f317965e03300 Mon Sep 17 00:00:00 2001
+From: Devon Loehr <dloehr@google.com>
+Date: Mon, 14 Jul 2025 16:00:47 +0000
+Subject: [PATCH] Add include
+
+---
+ .../openxr/src_overrides/src/loader/api_layer_interface.cpp      | 1 +
+ 1 file changed, 1 insertion(+)
+
+diff --git a/third_party/openxr/src_overrides/src/loader/api_layer_interface.cpp b/third_party/openxr/src_overrides/src/loader/api_layer_interface.cpp
+index a93d45da37397..178d1630ed58d 100644
+--- a/third_party/openxr/src_overrides/src/loader/api_layer_interface.cpp
++++ b/third_party/openxr/src_overrides/src/loader/api_layer_interface.cpp
+@@ -19,6 +19,7 @@
+ #include <openxr/openxr_loader_negotiation.h>
+ 
+ #include <cstring>
++#include <iterator>
+ #include <memory>
+ #include <sstream>
+ #include <string>
+-- 
+2.50.0.727.gbf7dc18ff4-goog
+