Initial CL for Downloads resumption.

content/public/browser/download_item.h

Index: content/public/browser/download_item.h
diff --git a/content/public/browser/download_item.h b/content/public/browser/download_item.h
index 9eaf629612e7ca77f2f89701deba996ac6da7bd2..c731a47687250acd997eb85e238b922d4a1c2b72 100644
--- a/content/public/browser/download_item.h
+++ b/content/public/browser/download_item.h
@@ -27,6 +27,7 @@
 #include "content/public/browser/download_danger_type.h"
 #include "content/public/browser/download_interrupt_reasons.h"
 #include "content/public/common/page_transition_types.h"
+#include "net/base/net_log.h"
 
 class FilePath;
 class GURL;
@@ -122,6 +123,9 @@ class CONTENT_EXPORT DownloadItem : public base::SupportsUserData {
   // Allow the user to temporarily pause a download or resume a paused download.
   virtual void TogglePause() = 0;
 
+  // Resume a download that's been interrupted.
+  virtual void ResumeInterruptedDownload() = 0;
+
   // Cancel the download operation. We need to distinguish between cancels at
   // exit (DownloadManager destructor) from user interface initiated cancels
   // because at exit, the history system may not exist, and any updates to it
@@ -157,6 +161,7 @@ class CONTENT_EXPORT DownloadItem : public base::SupportsUserData {
   virtual DownloadInterruptReason GetLastReason() const = 0;
 
   virtual bool IsPaused() const = 0;
+  virtual bool CanResumeInterrupted() const = 0;
   virtual bool IsTemporary() const = 0;
 
   //    Convenience routines for accessing GetState() results conceptually -----
@@ -277,6 +282,9 @@ class CONTENT_EXPORT DownloadItem : public base::SupportsUserData {
   // Returns true if it is OK to open the download.
   virtual bool CanOpenDownload() = 0;
 
+  // Returns true if the download is paused or interrupted, and can be resumed.
+  virtual bool CanResumeDownload() const = 0;
+
   // Tests if a file type should be opened automatically.
   virtual bool ShouldOpenFileBasedOnExtension() = 0;