Add a Rappor option in the settings page.

components/policy/resources/policy_templates.json

 {
 # policy_templates.json - Metafile for policy templates
 #
 # The content of this file is evaluated as a Python expression.
 #
 # This file is used as input to generate the following policy templates:
 # ADM, ADMX+ADML, MCX/plist and html documentation.
 #
 # Policy templates are user interface definitions or documents about the
 # policies that can be used to configure Chrome. Each policy is a name-value
@@ skipping 950 matching lines @@
       'type': 'main',
       'schema': { 'type': 'boolean' },
       'supported_on': ['chrome.*:8-'],
       'features': {
         'can_be_recommended': True,
         'dynamic_refresh': False,
         'per_profile': False,
       },
       'example_value': True,
       'id': 15,
-      'caption': '''Enable reporting of usage and crash-related data''',
-      'desc': '''Enables anonymous reporting of usage and crash-related data about <ph name="PRODUCT_NAME">$1<ex>Google Chrome</ex></ph> to Google and prevents users from changing this setting.
+      'caption': '''Enable reporting of RAPPOR, usage, and crash-related data''',
+      'desc': '''Enables anonymous reporting of RAPPOR, usage, and crash-related data about <ph name="PRODUCT_NAME">$1<ex>Google Chrome</ex></ph> to Google and prevents users from changing this setting.
 
-      If you enable this setting, anonymous reporting of usage and crash-related data is sent to Google.
+      If you enable this setting, anonymous reporting of RAPPOR, usage and crash-related data is sent to Google.
 
-      If you disable this setting, anonymous reporting of usage and crash-related data is never sent to Google.
+      If you disable this setting, anonymous reporting of RAPPOR, usage and crash-related data is never sent to Google.
 
       If you enable or disable this setting, users cannot change or override this setting in <ph name="PRODUCT_NAME">$1<ex>Google Chrome</ex></ph>.
 
       If this policy is left not set the setting will be what the user chose upon installation / first run.''',

[Mattias Nissler (ping if slow), 2015/02/10 21:29:09]

Is the user actually prompted for RAPPOR on/off during first run?

[Steven Holte, 2015/02/10 21:44:32]

No, we don't have any first run UI.  Took a stab at rewriting this.

     },
     {
       'name': 'PasswordManager',
       'type': 'group',
       'caption': '''Password manager''',
       'desc': '''Configures the password manager. If the password manager is enabled, then you can choose to enable or disable whether the user may show stored passwords in clear text.''',
       'policies': [
         {
           'name': 'PasswordManagerEnabled',
           'type': 'main',
@@ skipping 6260 matching lines @@
       'desc': '''Text appended in parentheses next to the policies top-level container to indicate that those policies are of the Recommended level''',
       'text': 'Default Settings (users can override)',
     },
     'doc_complex_policies_on_windows': {
       'desc': '''Text pointing the user to a help article for complex policies on Windows''',
       'text': '''encoded as a JSON string, for details see <ph name="COMPLEX_POLICIES_URL">http://www.chromium.org/administrators/complex-policies-on-windows<ex>http://www.chromium.org/administrators/complex-policies-on-windows</ex></ph>''',
     },
   },
   'placeholders': [],
 }