ImageCapture: ScopedResultCallback

media/capture/video/video_capture_device.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.
 //
 // VideoCaptureDevice is the abstract base class for realizing video capture
 // device support in Chromium. It provides the interface for OS dependent
 // implementations.
 // The class is created and functions are invoked on a thread owned by
 // VideoCaptureManager. Capturing is done on other threads, depending on the OS
 // specific implementation.
@@ skipping 10 matching lines @@
 
 #include "base/files/file.h"
 #include "base/logging.h"
 #include "base/memory/ref_counted.h"
 #include "base/single_thread_task_runner.h"
 #include "base/time/time.h"
 #include "build/build_config.h"
 #include "media/base/media_export.h"
 #include "media/base/video_capture_types.h"
 #include "media/base/video_frame.h"
+#include "media/capture/video/scoped_result_callback.h"
+#include "mojo/public/cpp/bindings/array.h"
+#include "mojo/public/cpp/bindings/callback.h"
 #include "ui/gfx/gpu_memory_buffer.h"
 
 namespace tracked_objects {
 class Location;
 }  // namespace tracked_objects
 
 namespace media {
 
 class MEDIA_EXPORT VideoCaptureDevice {
  public:
@@ skipping 262 matching lines @@
   // memory associated with capture, and delete the |client| pointer passed into
   // AllocateAndStart.
   //
   // If deallocation is done asynchronously, then the device implementation must
   // ensure that a subsequent AllocateAndStart() operation targeting the same ID
   // would be sequenced through the same task runner, so that deallocation
   // happens first.
   virtual void StopAndDeAllocate() = 0;
 
   // Asynchronously takes a photo, possibly reconfiguring the capture objects
-  // and/or interrupting the capture flow. Returns false if taking the picture
-  // could not be scheduled at all, or else runs |photo_callback| (on the thread
-  // where TakePhoto() is run).
+  // and/or interrupting the capture flow. Runs |callback| on the thread
+  // where TakePhoto() is called, if the photo was successfully taken.
   using TakePhotoCallback =
-      base::Callback<void(const std::string&,
-                          std::unique_ptr<std::vector<uint8_t>>)>;
-  virtual bool TakePhoto(const TakePhotoCallback& photo_callback)
-      WARN_UNUSED_RESULT;
+      mojo::Callback<void(mojo::String, mojo::Array<uint8_t>)>;
+  virtual void TakePhoto(ScopedResultCallback<TakePhotoCallback> callback);
 
   // Gets the power line frequency, either from the params if specified by the
   // user or from the current system time zone.
   PowerLineFrequency GetPowerLineFrequency(
       const VideoCaptureParams& params) const;
 
  private:
   // Gets the power line frequency from the current system time zone if this is
   // defined, otherwise returns 0.
   PowerLineFrequency GetPowerLineFrequencyForLocation() const;
 };
 
 }  // namespace media
 
 #endif  // MEDIA_VIDEO_CAPTURE_VIDEO_CAPTURE_DEVICE_H_