[camera] Source code refactoring (#31)

Changes:
* Source code refactoring
* Add temporary code for camera image stream APIs

packages/camera/elinux/camera_stream_handler_impl.h

@@ -11,16 +11,10 @@
 
 class CameraStreamHandlerImpl : public CameraStreamHandler {
  public:
-  using OnNotifyInitialized = std::function<void()>;
   using OnNotifyFrameDecoded = std::function<void()>;
-  using OnNotifyCompleted = std::function<void()>;
 
-  CameraStreamHandlerImpl(OnNotifyInitialized on_notify_initialized,
-                          OnNotifyFrameDecoded on_notify_frame_decoded,
-                          OnNotifyCompleted on_notify_completed)
-      : on_notify_initialized_(on_notify_initialized),
-        on_notify_frame_decoded_(on_notify_frame_decoded),
-        on_notify_completed_(on_notify_completed) {}
+  CameraStreamHandlerImpl(OnNotifyFrameDecoded on_notify_frame_decoded)
+      : on_notify_frame_decoded_(on_notify_frame_decoded) {}
   virtual ~CameraStreamHandlerImpl() = default;
 
   // Prevent copying.
@@ -28,13 +22,6 @@ class CameraStreamHandlerImpl : public CameraStreamHandler {
   CameraStreamHandlerImpl& operator=(CameraStreamHandlerImpl const&) = delete;
 
  protected:
-  // |CameraStreamHandler|
-  void OnNotifyInitializedInternal() {
-    if (on_notify_initialized_) {
-      on_notify_initialized_();
-    }
-  }
-
   // |CameraStreamHandler|
   void OnNotifyFrameDecodedInternal() {
     if (on_notify_frame_decoded_) {
@@ -42,16 +29,7 @@ class CameraStreamHandlerImpl : public CameraStreamHandler {
     }
   }
 
-  // |CameraStreamHandler|
-  void OnNotifyCompletedInternal() {
-    if (on_notify_completed_) {
-      on_notify_completed_();
-    }
-  }
-
-  OnNotifyInitialized on_notify_initialized_;
   OnNotifyFrameDecoded on_notify_frame_decoded_;
-  OnNotifyCompleted on_notify_completed_;
 };
 
 #endif  // PACKAGES_CAMERA_CAMERA_ELINUX_CAMERA_STREAM_HANDLER_IMPL_H_