DevTools: disable the Chrome tab debugging warning for force-installed extensions.

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 9579 matching lines @@
       },
       'example_value': [ "xkb:us::en", "xkb:ch::ger" ],
       'max_size': 16777216,
       'id': 365,
       'caption': '''Device sign-in screen keyboard layouts''',
       'tags': [],
       'desc': '''Configures which keyboard layouts are allowed on the <ph name="PRODUCT_OS_NAME">$2<ex>Google Chrome OS</ex></ph> sign-in screen.
 
       If this policy is set to a list of input method identifiers, the given input methods will be available on the sign-in screen. The first given input method will be preselected. While a user pod is focused on the sign-in screen, the user's least recently used input method will be available in addition to the input methods given by this policy.  If this policy is not set, the input methods on the sign-in screen will be derived from the locale in which the sign-in screen is displayed.  Values which are not valid input method identifiers will be ignored.''',
     },
+    {
+      'name': 'DeveloperToolsSilentManagedDebuggerAPIEnabled',
+      'type': 'main',
+      'schema': { 'type': 'boolean' },
+      'supported_on': ['chrome.*:58-', 'chrome_os:58-'],
+      'features': {
+        'dynamic_refresh': True,
+        'per_profile': True,
+      },
+      'example_value': False,
+      'id': 366,
+      'caption': '''Enable Developer Tools silent <ph name="CHROME_DEBUGGER_API">chrome.debugger<ex>chrome.debugger</ex></ph> extensions API for force-installed extensions''',
+      'tags': ['system-security'],
+      'desc': '''Enables force-installed extensions to instrument the browser without the user-visible warning.
+
+      If this policy is set, force-installed browser extensions will be able to attach to the browser and instrument it without a user-visible warning.

[Thiemo Nagel, 2017/02/22 17:15:10]

Nit: set --> set to true

[pfeldman, 2017/02/22 18:17:43]

Done.

+
+      If this policy is unset (default), a user-visible warning shows up upon establishing new debugging sessions.'''

[Thiemo Nagel, 2017/02/22 17:15:10]

Nit: unset (default) --> false or unset

[pfeldman, 2017/02/22 18:17:43]

Done.

+    },
   ],
   'messages': {
     # Messages that are not associated to any policies.
     'win_supported_winxpsp2': {
       'desc': '''A label specifying the oldest possible compatible version of Windows. This text will appear right next to a label containing the text 'Supported on:'.''',
       'text': '''Microsoft Windows XP SP2 or later'''
     },
     'mac_chrome_preferences': {
       'desc': '''A text indicating in Mac OS X Workgroup Manager, that currently the preferences of Chromium are being edited''',
       'text': '''<ph name="PRODUCT_NAME">$1<ex>Google Chrome</ex></ph> preferences'''
@@ skipping 113 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">https://www.chromium.org/administrators/complex-policies-on-windows<ex>https://www.chromium.org/administrators/complex-policies-on-windows</ex></ph>''',
     },
   },
   'placeholders': [],
 }