Enable "gn check" for //third_party/blink/renderer/modules/xr

It has a circular dependency with modules/webgl:webgl, and this CL adds
allow_circular_includes_from to it. The circular dependency is safe
because they are in a single library.

This CL has no behavior changes.

Bug: 800764
Change-Id: If886c85bc1d4e39b7ab259e9efe89057f48d25d1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2398606
Commit-Queue: Takuto Ikuta <tikuta@chromium.org>
Auto-Submit: Kent Tamura <tkent@chromium.org>
Reviewed-by: Takuto Ikuta <tikuta@chromium.org>
Cr-Commit-Position: refs/heads/master@{#805206}

.gn

@@ -262,7 +262,6 @@ no_check_targets = [
   "//third_party/blink/renderer/modules/service_worker:*",  # 23 errors
   "//third_party/blink/renderer/modules/webcodecs:*",  # 13 errors
   "//third_party/blink/renderer/modules/webtransport:*",  # 16 errors
-  "//third_party/blink/renderer/modules/xr:*",  # 13 errors
   "//third_party/blink/renderer/modules:*",  # 321 errors
   "//third_party/blink/renderer/platform/heap:*",  # 65 errors
   "//third_party/blink/renderer/platform/instrumentation:*",  # 13 errors

third_party/blink/renderer/modules/webgl/BUILD.gn

@@ -174,4 +174,5 @@ blink_modules_sources("webgl") {
 
   public_deps = [ "//device/vr/public/mojom:mojom_blink" ]
   deps = [ "//third_party/blink/renderer/modules/xr:xr" ]
+  allow_circular_includes_from = deps
 }

third_party/blink/renderer/modules/xr/BUILD.gn

@@ -109,4 +109,6 @@ blink_modules_sources("xr") {
     "//device/vr/public/mojom:mojom_blink",
     "//services/metrics/public/cpp:ukm_builders",
   ]
+
+  public_deps = [ "//third_party/blink/renderer/modules/gamepad:gamepad" ]
 }