ImageCapture: introduce image_capture Blob to allow move-only semantics

content/browser/media/capture/image_capture_impl.cc

 // Copyright 2016 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.
 
 #include "content/browser/media/capture/image_capture_impl.h"
 
 #include <utility>
 
 #include "base/bind_helpers.h"
 #include "content/browser/browser_main_loop.h"
@@ skipping 33 matching lines @@
 }
 
 void RunFailedSetOptionsCallback(
     const ImageCaptureImpl::SetOptionsCallback& cb) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
   cb.Run(false);
 }
 
 void RunTakePhotoCallbackOnUIThread(
     const ImageCaptureImpl::TakePhotoCallback& callback,
-    const std::string& mime_type,
-    const std::vector<uint8_t>& data) {
-  // TODO(mcasas): Use a mojo typemapping instead of const_cast to avoid copying
-  // |data|, https://crbug.com/630040.
+    media::mojom::BlobPtr blob) {
   BrowserThread::PostTask(
       BrowserThread::UI, FROM_HERE,
-      base::Bind(callback, mime_type,
-                 base::Passed(const_cast<std::vector<uint8_t>*>(&data))));
+      base::Bind(callback, base::Passed(std::move(blob))));
 }
 
 void RunFailedTakePhotoCallback(const ImageCaptureImpl::TakePhotoCallback& cb) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
-  cb.Run("", std::vector<uint8_t>());
+  cb.Run(media::mojom::Blob::New());
 }
 
 void GetCapabilitiesOnIOThread(
     const std::string& source_id,
     MediaStreamManager* media_stream_manager,
     media::ScopedResultCallback<ImageCaptureImpl::GetCapabilitiesCallback>
         callback) {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
 
   const int session_id =
@@ skipping 93 matching lines @@
       base::Bind(&TakePhotoOnIOThread, source_id,
                  BrowserMainLoop::GetInstance()->media_stream_manager(),
                  base::Passed(&scoped_callback)));
 }
 
 ImageCaptureImpl::ImageCaptureImpl(
     mojo::InterfaceRequest<media::mojom::ImageCapture> request)
     : binding_(this, std::move(request)) {}
 
 }  // namespace content