Shift "commit point" for when a download will no longer accept cancels.

content/browser/download/download_item_impl.h

Index: content/browser/download/download_item_impl.h
diff --git a/content/browser/download/download_item_impl.h b/content/browser/download/download_item_impl.h
index ad8ed4db2fe8bc2d999a1149777831f7503bc0b2..bf7d1bdcbb50ac488114a979a2030589d2bdd133 100644
--- a/content/browser/download/download_item_impl.h
+++ b/content/browser/download/download_item_impl.h
@@ -207,6 +207,41 @@ class CONTENT_EXPORT DownloadItemImpl : public content::DownloadItem {
   virtual void SetDbHandle(int64 handle);
 
  private:
+  // Fine grained states of a download.
+  enum DownloadInternalState {
+    // Unless otherwise specified, state transitions are linear forward
+    // in this list.
+
+    // Includes both before and after file name determination.
+    // TODO(rdsmith): Put in state variable for file name determination.
+    IN_PROGRESS_INTERNAL,
+
+    // Between commit point (dispatch of download file release) and
+    // completed.  Embedder may be opening the file in this state.
+    COMPLETING_INTERNAL,
+
+    // After embedder has had a chance to auto-open.  User may now open
+    // or auto-open based on extension.
+    COMPLETE_INTERNAL,
+
+    // User has cancelled the download.
+    // Only incoming transition IN_PROGRESS->
+    CANCELLED_INTERNAL,
+
+    // An error has interrupted the download.
+    // Only incoming transition IN_PROGRESS->
+    INTERRUPTED_INTERNAL,
+
+    MAX_DOWNLOAD_INTERNAL_STATE,
+  };
+
+  // Map from DownloadInternalState -> DownloadState.
+  static const DownloadState kInternalStateMap[];
+
+  // Map from DownloadState -> DownloadInternalState (for external
+  // initialization).
+  static const DownloadInternalState kExternalStateMap[];
+
   // Normal progression of a download ------------------------------------------
 
   // These are listed in approximately chronological order.  There are also
@@ -249,13 +284,16 @@ class CONTENT_EXPORT DownloadItemImpl : public content::DownloadItem {
                         const std::string& final_hash);
 
   // Call to transition state; all state transitions should go through this.
-  void TransitionTo(DownloadState new_state);
+  void TransitionTo(DownloadInternalState new_state);
 
   // Set the |danger_type_| and invoke obserers if necessary.
   void SetDangerType(content::DownloadDangerType danger_type);
 
   void SetFullPath(const FilePath& new_path);
 
+  // Debugging routines --------------------------------------------------------
+  static const char* DebugDownloadStateString(DownloadInternalState state);
+
   // The handle to the request information.  Used for operations outside the
   // download system.
   scoped_ptr<DownloadRequestHandleInterface> request_handle_;
@@ -353,7 +391,7 @@ class CONTENT_EXPORT DownloadItemImpl : public content::DownloadItem {
   base::TimeTicks start_tick_;
 
   // The current state of this download.
-  DownloadState state_;
+  DownloadInternalState state_;
 
   // Current danger type for the download.
   content::DownloadDangerType danger_type_;