Add kUseWKWebViewLoading to features list

Bug: 991763
Change-Id: Ic08d8e45714b9503bb26dc1ad85687e4bddba1a7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1878410Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Commit-Queue: Yi Su <mrsuyi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709007}

ios/chrome/browser/flags/about_flags.mm

@@ -560,6 +560,9 @@ const flags_ui::FeatureEntry kFeatureEntries[] = {
      flag_descriptions::kTranslateInfobarMessagesUIName,
      flag_descriptions::kTranslateInfobarMessagesUIDescription,
      flags_ui::kOsIos, FEATURE_VALUE_TYPE(kTranslateInfobarMessagesUI)},
+    {"use-WKWebView-loading", flag_descriptions::kUseWKWebViewLoadingName,
+     flag_descriptions::kUseWKWebViewLoadingDescription, flags_ui::kOsIos,
+     FEATURE_VALUE_TYPE(web::features::kUseWKWebViewLoading)},
 };
 
 // Add all switches from experimental flags to |command_line|.

ios/chrome/browser/flags/ios_chrome_flag_descriptions.cc

@@ -370,6 +370,11 @@ const char kUseDdljsonApiName[] = "Use new ddljson API for Doodles";
 const char kUseDdljsonApiDescription[] =
     "Enables the new ddljson API to fetch Doodles for the NTP.";
 
+const char kUseWKWebViewLoadingName[] =
+    "Use WKWebView.loading for WebState::IsLoading";
+const char kUseWKWebViewLoadingDescription[] =
+    "Enables using WKWebView.loading for WebState::IsLoading";
+
 const char kWalletServiceUseSandboxName[] = "Use Google Payments sandbox";
 const char kWalletServiceUseSandboxDescription[] =
     "Uses the sandbox service for Google Payments API calls.";

ios/chrome/browser/flags/ios_chrome_flag_descriptions.h

@@ -326,6 +326,11 @@ extern const char kTranslateInfobarMessagesUIDescription[];
 extern const char kUseDdljsonApiName[];
 extern const char kUseDdljsonApiDescription[];
 
+// Title and description for the flag to enable using WKWebView.loading for
+// WebState::IsLoading.
+extern const char kUseWKWebViewLoadingName[];
+extern const char kUseWKWebViewLoadingDescription[];
+
 // Title and description for the flag to control if Google Payments API calls
 // should use the sandbox servers.
 extern const char kWalletServiceUseSandboxName[];