media: Enable ProtectedMediaIdentifierPermissionContext on ChromeOS.

chrome/browser/media/protected_media_identifier_permission_context.h

 // Copyright 2013 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.
 
 #ifndef CHROME_BROWSER_MEDIA_PROTECTED_MEDIA_IDENTIFIER_PERMISSION_CONTEXT_H_
 #define CHROME_BROWSER_MEDIA_PROTECTED_MEDIA_IDENTIFIER_PERMISSION_CONTEXT_H_
 
 #include "chrome/browser/content_settings/permission_context_base.h"
 
 class PermissionRequestID;
@@ skipping 11 matching lines @@
  public:
   explicit ProtectedMediaIdentifierPermissionContext(Profile* profile);
 
   // In addition to the base class flow checks that it is only code from
   // valid iframes. It also adds special logic when called through an extension.
   void RequestPermission(content::WebContents* web_contents,
                          const PermissionRequestID& id,
                          const GURL& requesting_frame_origin,
                          bool user_gesture,
                          const BrowserPermissionCallback& callback) override;
+  ContentSetting GetPermissionStatus(
+      const GURL& requesting_origin,
+      const GURL& embedding_origin) const override;
 
  private:
   ~ProtectedMediaIdentifierPermissionContext() override;
 
   void UpdateTabContext(const PermissionRequestID& id,
                         const GURL& requesting_frame,
                         bool allowed) override;
 
+  // Returns whether "Protected content" is enabled. It can be disabled by a
+  // user in the master switch in content settings, or by the device policy.
+  bool IsProtectedMediaIdentifierEnabled() const;
+
   DISALLOW_COPY_AND_ASSIGN(ProtectedMediaIdentifierPermissionContext);
 };
 
 #endif  // CHROME_BROWSER_MEDIA_PROTECTED_MEDIA_IDENTIFIER_PERMISSION_CONTEXT_H_