Download resumption - Preliminary

content/public/browser/download_manager_delegate.cc

Index: content/public/browser/download_manager_delegate.cc
diff --git a/content/public/browser/download_manager_delegate.cc b/content/public/browser/download_manager_delegate.cc
index 8826b976ae1d3c216eac88a80bfe617b6424e906..7d1f61207a05cba3bf5e4c75bec8bcc014af17d6 100644
--- a/content/public/browser/download_manager_delegate.cc
+++ b/content/public/browser/download_manager_delegate.cc
@@ -4,6 +4,7 @@
 
 #include "content/public/browser/download_manager_delegate.h"
 
+#include "base/file_util.h"
 #include "content/public/browser/download_id.h"
 #include "content/public/browser/download_item.h"
 
@@ -19,6 +20,16 @@ bool DownloadManagerDelegate::DetermineDownloadTarget(
   return false;
 }
 
+int64 DownloadManagerDelegate::GetIntermediateFileLength(
+    const FilePath& path, bool temporary) {
+  // Validate the start offset.
+  int64 end = 0;
+  if (file_util::GetFileSize(path, &end)) {
+    return end;
+  }
+  return 0;
+}
+
 WebContents* DownloadManagerDelegate::
     GetAlternativeWebContentsToNotifyForDownload() {
   return NULL;