[iOS][Credential-Provider] Add app entitlement

Adds the Credential Provider Entitlement at the app level.

Bug: 1044639
Change-Id: Iabdf3084ed457b4cce2e604a32a4c1f671d4ed35
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2209073Reviewed-by: Olivier Robin <olivierrobin@chromium.org>
Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Commit-Queue: Javier Ernesto Flores Robles <javierrobles@chromium.org>
Cr-Commit-Position: refs/heads/master@{#775139}

ios/chrome/app/BUILD.gn

@@ -113,6 +113,9 @@ compile_entitlements("entitlements") {
   if (ios_chrome_entitlements_additions != []) {
     entitlements_templates += ios_chrome_entitlements_additions
   }
+  if (ios_enable_credential_provider_extension) {
+    entitlements_templates += [ "resources/CredentialProvider.entitlements" ]
+  }
   substitutions = [ "IOS_BUNDLE_ID_PREFIX=$ios_app_bundle_id_prefix" ]
   output_name = "$target_gen_dir/$chromium_short_name.entitlements"
 }

ios/chrome/app/resources/CredentialProvider.entitlements

+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>com.apple.developer.authentication-services.autofill-credential-provider</key>
+	<true/>
+</dict>
+</plist>