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

This CL has no behavior changes.

Bug: 800764
Change-Id: If9ae82d08aa4b8eac163a19001cbcd6a402f5e2d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2398744
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@{#805178}

.gn

@@ -264,7 +264,6 @@ no_check_targets = [
   "//third_party/blink/renderer/modules/serial:*",  # 1 error
   "//third_party/blink/renderer/modules/service_worker:*",  # 23 errors
   "//third_party/blink/renderer/modules/webcodecs:*",  # 13 errors
-  "//third_party/blink/renderer/modules/webgl:*",  # 3 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/modules/webgl/BUILD.gn

@@ -171,4 +171,7 @@ blink_modules_sources("webgl") {
   # the implementation depends on a fair chunk of core/ --
   # include the core pch for faster Windows compilation times.
   configs += [ "//third_party/blink/renderer/core:blink_core_pch" ]
+
+  public_deps = [ "//device/vr/public/mojom:mojom_blink" ]
+  deps = [ "//third_party/blink/renderer/modules/xr:xr" ]
 }