[iOS CBCM] Add experimental settings for CBCM testing

Adds two new experimental settings to help manual testing of CBCM on
iOS:

1) EnableChromeBrowserCloudManagement to force enable CBCM infra
2) CloudManagementEnrollmentToken to provide an enrollment token

This change also creates a new "Enterprise Settings" section in the
experimental settings, since there are now three Enterprise-related
experimental settings.

Bug: 1066495
Change-Id: I8b88c408c5866cb130373712af6201269be39c36
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2353394
Commit-Queue: Guillaume Jenkins <gujen@google.com>
Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#797731}

ios/chrome/browser/flags/about_flags.mm

@@ -708,6 +708,9 @@ void AppendSwitchesFromExperimentalSettings(base::CommandLine* command_line) {
                                     web::BuildMobileUserAgent(product));
   }
 
+  // Shared policy dictionary for all enterprise experimental flags.
+  NSMutableDictionary* testing_policies = [[NSMutableDictionary alloc] init];
+
   // Set some sample policy values for testing if EnableSamplePolicies is
   // enabled.
   if ([defaults boolForKey:@"EnableSamplePolicies"]) {
@@ -726,7 +729,7 @@ void AppendSwitchesFromExperimentalSettings(base::CommandLine* command_line) {
     ];
 
     // Define sample policies to enable.
-    NSDictionary* testing_policies = @{
+    [testing_policies addEntriesFromDictionary:@{
       base::SysUTF8ToNSString(policy::key::kEnableExperimentalPolicies) :
           experimental_policies,
 
@@ -751,7 +754,22 @@ void AppendSwitchesFromExperimentalSettings(base::CommandLine* command_line) {
       base::SysUTF8ToNSString(policy::key::kPasswordManagerEnabled) : @NO,
 
       base::SysUTF8ToNSString(policy::key::kTranslateEnabled) : @NO,
-    };
+    }];
+  }
+
+  // If a CBCM enrollment token is provided, force Chrome Browser Cloud
+  // Management to enabled and add the token to the list of policies.
+  NSString* token_key =
+      base::SysUTF8ToNSString(policy::key::kCloudManagementEnrollmentToken);
+  NSString* token = [defaults stringForKey:token_key];
+
+  if ([token length] > 0) {
+    command_line->AppendSwitch(switches::kEnableChromeBrowserCloudManagement);
+    [testing_policies setValue:token forKey:token_key];
+  }
+
+  // If some policies were set, commit them to the app's registration defaults.
+  if ([testing_policies count] > 0) {
     NSDictionary* registration_defaults =
         @{kPolicyLoaderIOSConfigurationKey : testing_policies};
     [defaults registerDefaults:registration_defaults];

ios/chrome/browser/resources/Settings.bundle/Experimental.plist

@@ -130,6 +130,12 @@
 			<key>DefaultValue</key>
 			<false/>
 		</dict>
+		<dict>
+			<key>Type</key>
+			<string>PSGroupSpecifier</string>
+			<key>Title</key>
+			<string>Enterprise Settings</string>
+		</dict>
 		<dict>
 			<key>Type</key>
 			<string>PSToggleSwitchSpecifier</string>
@@ -140,6 +146,18 @@
 			<key>DefaultValue</key>
 			<false/>
 		</dict>
+		<dict>
+			<key>Type</key>
+			<string>PSTextFieldSpecifier</string>
+			<key>Title</key>
+			<string>CBCM Enrollment Token</string>
+			<key>Key</key>
+			<string>CloudManagementEnrollmentToken</string>
+			<key>DefaultValue</key>
+			<string></string>
+			<key>AutocorrectionType</key>
+			<string>No</string>
+		</dict>
 		<dict>
 			<key>Type</key>
 			<string>PSGroupSpecifier</string>