Enable autofill uma histograms by security levels

Change-Id: I67237332cc5d7e754b170cb09e1728442aada688
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2144678Reviewed-by: Hiroshi Ichikawa <ichikawa@chromium.org>
Reviewed-by: Christopher Thompson <cthomp@chromium.org>
Commit-Queue: John Wu <jzw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#758259}

ios/web_view/BUILD.gn

@@ -277,6 +277,7 @@ source_set("web_view_sources") {
     "//components/pref_registry",
     "//components/prefs",
     "//components/proxy_config",
+    "//components/security_state/ios",
     "//components/signin/core/browser",
     "//components/signin/ios/browser",
     "//components/signin/public/identity_manager",

ios/web_view/internal/DEPS

@@ -20,6 +20,7 @@ include_rules = [
   "+components/pref_registry",
   "+components/prefs",
   "+components/proxy_config",
+  "+components/security_state/ios",
   "+components/signin/core/browser",
   "+components/signin/ios",
   "+components/signin/public",

ios/web_view/internal/autofill/web_view_autofill_client_ios.mm

@@ -14,6 +14,7 @@
 #include "components/autofill/core/browser/payments/payments_client.h"
 #include "components/autofill/core/common/autofill_prefs.h"
 #include "components/autofill/ios/browser/autofill_util.h"
+#include "components/security_state/ios/security_state_utils.h"
 #import "ios/web/public/web_state.h"
 #include "ios/web_view/internal/app/application_context.h"
 #import "ios/web_view/internal/autofill/web_view_autofill_log_router_factory.h"
@@ -118,9 +119,7 @@ AddressNormalizer* WebViewAutofillClientIOS::GetAddressNormalizer() {
 
 security_state::SecurityLevel
 WebViewAutofillClientIOS::GetSecurityLevelForUmaHistograms() {
-  // The metrics are not recorded for iOS webview, so return the count value
-  // which will not be recorded.
-  return security_state::SecurityLevel::SECURITY_LEVEL_COUNT;
+  return security_state::GetSecurityLevelForWebState(web_state_);
 }
 
 void WebViewAutofillClientIOS::ShowAutofillSettings(