Change webcamPrivate.set/get/reset to async APIs.

extensions/browser/api/webcam_private/visca_webcam.h

 // Copyright 2015 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 EXTENSIONS_BROWSER_API_WEBCAM_PRIVATE_VISCA_WEBCAM_H_
 #define EXTENSIONS_BROWSER_API_WEBCAM_PRIVATE_VISCA_WEBCAM_H_
 
 #include <deque>
 
 #include "base/callback.h"
@@ skipping 12 matching lines @@
 
   // Open and initialize the web camera. This is done by the following three
   // steps (in order): 1. Open the serial port;  2. Request address; 3. Clear
   // the command buffer. After these three steps completes, |open_callback| will
   // be called.
   void Open(const OpenCompleteCallback& open_callback);
 
  private:
   ~ViscaWebcam() override;
 
-  enum CommandType {
-    COMMAND,
+  enum InquiryType {
     INQUIRY_PAN,
     INQUIRY_TILT,
     INQUIRY_PAN_TILT,
     INQUIRY_ZOOM,
   };
 
   using CommandCompleteCallback =
       base::Callback<void(bool, const std::vector<char>&)>;
 
   void OpenOnIOThread(const OpenCompleteCallback& open_callback);
@@ skipping 14 matching lines @@
   // Send or queue a command and wait for the camera's response.
   void Send(const std::vector<char>& command,
             const CommandCompleteCallback& callback);
   void OnSendCompleted(const CommandCompleteCallback& callback,
                        int bytes_sent,
                        api::serial::SendError error);
   void ReceiveLoop(const CommandCompleteCallback& callback);
   void OnReceiveCompleted(const CommandCompleteCallback& callback,
                           const std::vector<char>& data,
                           api::serial::ReceiveError error);
+
   // Callback function that will be called after the send and reply of a command
-  // are both completed. Update |value| according to |type| and |response| if
-  // necessory.
-  void OnCommandCompleted(CommandType type,
-                          int* value,
+  // are both completed.
+  void OnCommandCompleted(const SetPTZCompleteCallback& callback,
+                          bool success,
+                          const std::vector<char>& response);
+  // Callback function that will be called after the send and reply of an
+  // inquiry are both completed.
+  void OnInquiryCompleted(InquiryType type,
+                          const GetPTZCompleteCallback& callback,
                           bool success,
                           const std::vector<char>& response);
 
   // Webcam Overrides:
-  void Reset(bool pan, bool tilt, bool zoom) override;
-  bool GetPan(int* value) override;
-  bool GetTilt(int* value) override;
-  bool GetZoom(int* value) override;
-  bool SetPan(int value) override;
-  bool SetTilt(int value) override;
-  bool SetZoom(int value) override;
-  bool SetPanDirection(PanDirection direction) override;
-  bool SetTiltDirection(TiltDirection direction) override;
+  void GetPan(const GetPTZCompleteCallback& callback) override;
+  void GetTilt(const GetPTZCompleteCallback& callback) override;
+  void GetZoom(const GetPTZCompleteCallback& callback) override;
+  void SetPan(int value, const SetPTZCompleteCallback& callback) override;
+  void SetTilt(int value, const SetPTZCompleteCallback& callback) override;
+  void SetZoom(int value, const SetPTZCompleteCallback& callback) override;
+  void SetPanDirection(PanDirection direction,
+                       const SetPTZCompleteCallback& callback) override;
+  void SetTiltDirection(TiltDirection direction,
+                        const SetPTZCompleteCallback& callback) override;
+  void Reset(bool pan,
+             bool tilt,
+             bool zoom,
+             const SetPTZCompleteCallback& callback) override;
 
   const std::string path_;
   const std::string extension_id_;
 
   scoped_ptr<SerialConnection> serial_connection_;
 
   // Stores the response for the current command.
   std::vector<char> data_buffer_;
   // Queues commands till the current command completes.
   std::deque<std::pair<std::vector<char>, CommandCompleteCallback>> commands_;
 
   // Visca webcam always get/set pan-tilt together. |pan| and |tilt| are used to
   // store the current value of pan and tilt positions.
   int pan_;
   int tilt_;
 
   base::WeakPtrFactory<ViscaWebcam> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ViscaWebcam);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_API_WEBCAM_PRIVATE_VISCA_WEBCAM_H_