Reland "Revert "[ios] Add EG test to chrome://management page""

Reland https://chromium-review.googlesource.com/c/chromium/src/+/2432316 with fix.

The third patchset is the reverted cl.

The issue is caused because the link navigates to an external page,
but the test can't always load a external page, so the trybot fails
randomly. Fixed by only checking if the link can be tapped.

Change-Id: I932e8976b6b99236003420cd87e21f6c339f2376
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2436774Reviewed-by: Sergio Collazos <sczs@chromium.org>
Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Commit-Queue: Tina Wang <tinazwang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812095}

components/management/resources/management.html

@@ -31,7 +31,7 @@
     <div id="managed-info" class="hidden">
       <div id="main-message">$i18n{managementMessage}</div>
       <div id="secondary-message">$i18n{managedInfo}
-        <a target="_blank" href=$i18n{learnMoreURL}>$i18n{learnMore}</a>
+        <a id="learn-more-link" target="_blank" href=$i18n{learnMoreURL}>$i18n{learnMore}</a>
       </div>
     </div>
     <div id="unmanaged-info" class="hidden">$i18n{unmanagedInfo}</div>

ios/chrome/browser/policy/policy_egtest.mm

@@ -275,4 +275,29 @@ id<GREYMatcher> ToolsMenuTranslateButton() {
       assertWithMatcher:grey_notNil()];
 }
 
+// Test the chrome://management page when no machine level policy is set.
+- (void)testManagementPageUnmanaged {
+  // Open the management page and check if the content is expected.
+  [ChromeEarlGrey loadURL:GURL("chrome://management")];
+  [ChromeEarlGrey
+      waitForWebStateContainingText:l10n_util::GetStringUTF8(
+                                        IDS_IOS_MANAGEMENT_UI_UNMANAGED_DESC)];
+}
+
+// Test the chrome://management page when one or more machine level policies are
+// set.
+- (void)testManagementPageManaged {
+  // Setup a machine level policy.
+  SetPolicy(false, policy::key::kTranslateEnabled);
+
+  // Open the management page and check if the content is expected.
+  [ChromeEarlGrey loadURL:GURL("chrome://management")];
+  [ChromeEarlGrey
+      waitForWebStateContainingText:l10n_util::GetStringUTF8(
+                                        IDS_IOS_MANAGEMENT_UI_MESSAGE)];
+
+  // Open the "learn more" link.
+  [ChromeEarlGrey tapWebStateElementWithID:@"learn-more-link"];
+}
+
 @end

ios/chrome/test/earl_grey/chrome_matchers_app_interface.mm

@@ -309,8 +309,10 @@ UIView* SubviewWithAccessibilityIdentifier(NSString* accessibility_id,
 
 + (id<GREYMatcher>)omniboxContainingText:(NSString*)text {
   GREYElementMatcherBlock* matcher = [GREYElementMatcherBlock
-      matcherWithMatchesBlock:^BOOL(UITextField* element) {
-        return [element.text containsString:text];
+      matcherWithMatchesBlock:^BOOL(id element) {
+        OmniboxTextFieldIOS* omnibox =
+            base::mac::ObjCCast<OmniboxTextFieldIOS>(element);
+        return [omnibox.text containsString:text];
       }
       descriptionBlock:^void(id<GREYDescription> description) {
         [description