Adds USB writing for OS X.

chrome/utility/image_writer/image_writer_handler.cc

 // Copyright 2014 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 "chrome/utility/image_writer/image_writer_handler.h"
+
 #include "base/files/file_path.h"
+#include "base/message_loop/message_loop.h"
+#include "base/message_loop/message_pump_mac.h"
 #include "chrome/common/chrome_utility_messages.h"
 #include "chrome/utility/image_writer/error_messages.h"
-#include "chrome/utility/image_writer/image_writer_handler.h"
 #include "content/public/utility/utility_thread.h"
 
 namespace image_writer {
 
 ImageWriterHandler::ImageWriterHandler() {}
 ImageWriterHandler::~ImageWriterHandler() {}
 
 void ImageWriterHandler::SendSucceeded() {
   Send(new ChromeUtilityHostMsg_ImageWriter_Succeeded());
   content::UtilityThread::Get()->ReleaseProcessIfNeeded();
@@ skipping 38 matching lines @@
   if (image_writer_->IsRunning()) {
     SendFailed(error::kOperationAlreadyInProgress);
     return;
   }
 
   if (!image_writer_->IsValidDevice()) {
     SendFailed(error::kInvalidDevice);
     return;
   }
 
-  if (!image_writer_->UnmountVolumes()) {
-    SendFailed(error::kUnmountVolumes);
-    return;
-  }
-
-  image_writer_->Write();
+  image_writer_->UnmountVolumes(
+      base::Bind(&ImageWriter::Write, image_writer_->AsWeakPtr()));
 }
 
 void ImageWriterHandler::OnVerifyStart(const base::FilePath& image,
                                        const base::FilePath& device) {
   if (!image_writer_.get() || image != image_writer_->GetImagePath() ||
       device != image_writer_->GetDevicePath()) {
     image_writer_.reset(new ImageWriter(this, image, device));
   }
 
   if (image_writer_->IsRunning()) {
@@ skipping 11 matching lines @@
 
 void ImageWriterHandler::OnCancel() {
   if (image_writer_.get()) {
     image_writer_->Cancel();
   } else {
     SendCancelled();
   }
 }
 
 }  // namespace image_writer