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

chrome/browser/extensions/api/debugger/debugger_api.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Implements the Chrome Extensions Debugger API.
 
 #include "chrome/browser/extensions/api/debugger/debugger_api.h"
 
 #include <stddef.h>
 
@@ skipping 322 matching lines @@
   extension_registry_observer_.Add(ExtensionRegistry::Get(profile_));
 
   // RVH-based agents disconnect from their clients when the app is terminating
   // but shared worker-based agents do not.
   // Disconnect explicitly to make sure that |this| observer is not leaked.
   registrar_.Add(this, chrome::NOTIFICATION_APP_TERMINATING,
                  content::NotificationService::AllSources());
 
   // Attach to debugger and tell it we are ready.
   agent_host_->AttachClient(this);
+  if (base::CommandLine::ForCurrentProcess()->HasSwitch(
+          ::switches::kSilentDebuggerExtensionAPI)) {
+    return;
+  }
 
-  if (!base::CommandLine::ForCurrentProcess()->HasSwitch(
-          ::switches::kSilentDebuggerExtensionAPI)) {
-    infobar_ = ExtensionDevToolsInfoBar::Create(
-        extension_id, extension_name, this,
-        base::Bind(&ExtensionDevToolsClientHost::InfoBarDismissed,
-                   base::Unretained(this)));
-  }
+  const Extension* extension =
+      ExtensionRegistry::Get(profile)->enabled_extensions().GetByID(
+          extension_id);
+  if (Manifest::IsPolicyLocation(extension->location()))

[Devlin, 2017/02/23 21:46:40]

nit: Can we add a comment here like:
// We allow policy-installed extensions to circumvent the normal
// infobar warning. See crbug.com/693621.

+    return;
+  infobar_ = ExtensionDevToolsInfoBar::Create(
+      extension_id, extension_name, this,
+      base::Bind(&ExtensionDevToolsClientHost::InfoBarDismissed,
+                 base::Unretained(this)));
 }
 
 ExtensionDevToolsClientHost::~ExtensionDevToolsClientHost() {
   if (infobar_)
     infobar_->Remove(this);
   g_attached_client_hosts.Get().erase(this);
 }
 
 // DevToolsAgentHostClient implementation.
 void ExtensionDevToolsClientHost::AgentHostClosed(
@@ skipping 368 matching lines @@
 void DebuggerGetTargetsFunction::SendTargetList(
     const content::DevToolsAgentHost::List& target_list) {
   std::unique_ptr<base::ListValue> result(new base::ListValue());
   for (size_t i = 0; i < target_list.size(); ++i)
     result->Append(SerializeTarget(target_list[i]));
   SetResult(std::move(result));
   SendResponse(true);
 }
 
 }  // namespace extensions