Implement basic mojo Permission service and use it for Geolocation.

content/browser/geolocation/geolocation_dispatcher_host.h

-// 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.
-
-#ifndef CONTENT_BROWSER_GEOLOCATION_GEOLOCATION_DISPATCHER_HOST_H_
-#define CONTENT_BROWSER_GEOLOCATION_GEOLOCATION_DISPATCHER_HOST_H_
-
-#include <map>
-#include <vector>
-
-#include "base/callback_forward.h"
-#include "base/memory/weak_ptr.h"
-#include "content/public/browser/web_contents_observer.h"
-
-class GURL;
-
-namespace content {
-
-// GeolocationDispatcherHost is an observer for Geolocation permissions-related
-// messages. In this role, it's the complement of GeolocationDispatcher (owned
-// by RenderFrame).
-// TODO(blundell): Eliminate this class in favor of having
-// Mojo handle permissions for geolocation once there is resolution on how
-// that will work. crbug.com/420498
-class GeolocationDispatcherHost : public WebContentsObserver {
- public:
-  explicit GeolocationDispatcherHost(WebContents* web_contents);
-  ~GeolocationDispatcherHost() override;
-
- private:
-  // WebContentsObserver
-  void RenderFrameDeleted(RenderFrameHost* render_frame_host) override;
-  void DidNavigateAnyFrame(RenderFrameHost* render_frame_host,
-                                   const LoadCommittedDetails& details,
-                                   const FrameNavigateParams& params) override;
-  bool OnMessageReceived(const IPC::Message& msg,
-                         RenderFrameHost* render_frame_host) override;
-
-  // Message handlers:
-  // TODO(mlamouri): |requesting_origin| should be a security origin to
-  // guarantee that a proper origin is passed.
-  void OnRequestPermission(RenderFrameHost* render_frame_host,
-                           int bridge_id,
-                           const GURL& requesting_origin,
-                           bool user_gesture);
-
-  void SendGeolocationPermissionResponse(int render_process_id,
-                                         int render_frame_id,
-                                         int bridge_id,
-                                         bool allowed);
-
-  // Clear pending permissions associated with a given frame and request the
-  // browser to cancel the permission requests.
-  void CancelPermissionRequestsForFrame(RenderFrameHost* render_frame_host);
-
-  struct PendingPermission {
-    PendingPermission(int render_frame_id,
-                      int render_process_id,
-                      int bridge_id,
-                      const GURL& origin);
-    ~PendingPermission();
-    int render_frame_id;
-    int render_process_id;
-    int bridge_id;
-    GURL origin;
-  };
-  std::vector<PendingPermission> pending_permissions_;
-
-  base::WeakPtrFactory<GeolocationDispatcherHost> weak_factory_;
-
-  DISALLOW_COPY_AND_ASSIGN(GeolocationDispatcherHost);
-};
-
-}  // namespace content
-
-#endif  // CONTENT_BROWSER_GEOLOCATION_GEOLOCATION_DISPATCHER_HOST_H_