[sensors] Add Permission guard to the generic sensor apis.

chrome/browser/permissions/permission_request.h

 // Copyright 2014 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_PERMISSIONS_PERMISSION_REQUEST_H_
 #define CHROME_BROWSER_PERMISSIONS_PERMISSION_REQUEST_H_
 
 #include "base/macros.h"
 #include "base/strings/string16.h"
 #include "components/content_settings/core/common/content_settings_types.h"
@@ skipping 17 matching lines @@
   QUOTA,
   DOWNLOAD,
   MEDIA_STREAM,
   REGISTER_PROTOCOL_HANDLER,
   PERMISSION_GEOLOCATION,
   PERMISSION_MIDI_SYSEX,
   PERMISSION_NOTIFICATIONS,
   PERMISSION_PROTECTED_MEDIA_IDENTIFIER,
   PERMISSION_PUSH_MESSAGING,
   PERMISSION_FLASH,
+  PERMISSION_SENSORS,
   // NUM must be the last value in the enum.
   NUM
 };
 
 // Used for UMA to record whether a gesture was associated with the request. For
 // simplicity not all request types track whether a gesture is associated with
 // it or not, for these types of requests metrics are not recorded.
 enum class PermissionRequestGestureType {
   UNKNOWN,
   GESTURE,
@@ skipping 73 matching lines @@
   bool persist() const { return persist_; }
 
  private:
   // Whether or not the response for this prompt should be persisted.
   bool persist_;
 
   DISALLOW_COPY_AND_ASSIGN(PermissionRequest);
 };
 
 #endif  // CHROME_BROWSER_PERMISSIONS_PERMISSION_REQUEST_H_