Disable system suspend while downloading files on win32....

chrome/browser/download/download_file.h

 // Copyright (c) 2006-2008 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.
 //
 // Objects that handle file operations for downloads, on the download thread.
 //
 // The DownloadFileManager owns a set of DownloadFile objects, each of which
 // represent one in progress download and performs the disk IO for that
 // download. The DownloadFileManager itself is a singleton object owned by the
 // ResourceDispatcherHost.
@@ skipping 33 matching lines @@
 #include <map>
 #include <vector>
 
 #include "app/gfx/native_widget_types.h"
 #include "base/basictypes.h"
 #include "base/file_path.h"
 #include "base/hash_tables.h"
 #include "base/lock.h"
 #include "base/ref_counted.h"
 #include "base/timer.h"
+#include "chrome/browser/power_save_blocker.h"
 #include "googleurl/src/gurl.h"
 
 namespace net {
 class IOBuffer;
 }
 struct DownloadCreateInfo;
 class DownloadManager;
 class MessageLoop;
 class ResourceDispatcherHost;
 class URLRequestContext;
@@ skipping 82 matching lines @@
 
   // Full path to the downloaded file.
   FilePath full_path_;
 
   // Whether the download is still using its initial temporary path.
   bool path_renamed_;
 
   // Whether the download is still receiving data.
   bool in_progress_;
 
+  // RAII handle to keep the system from sleeping while we're downloading.
+  PowerSaveBlocker dont_sleep_;
+
   DISALLOW_COPY_AND_ASSIGN(DownloadFile);
 };
 
 
 // DownloadFileManager ---------------------------------------------------------
 
 // Manages all in progress downloads.
 class DownloadFileManager
     : public base::RefCountedThreadSafe<DownloadFileManager> {
  public:
@@ skipping 118 matching lines @@
   // Used for progress updates on the UI thread, mapping download->id() to bytes
   // received so far. Written to by the file thread and read by the UI thread.
   typedef base::hash_map<int, int64> ProgressMap;
   ProgressMap ui_progress_;
   Lock progress_lock_;
 
   DISALLOW_COPY_AND_ASSIGN(DownloadFileManager);
 };
 
 #endif  // CHROME_BROWSER_DOWNLOAD_DOWNLOAD_FILE_H_