Adding a DownloadRestrictions group policy.

chrome/browser/download/download_prefs.h

Index: chrome/browser/download/download_prefs.h
diff --git a/chrome/browser/download/download_prefs.h b/chrome/browser/download/download_prefs.h
index d0c8cfaa6a0abaf5a0643b9418285b817ebb27ad..f745a3a8b8f4335125601ff85c770bcf8b9a1875 100644
--- a/chrome/browser/download/download_prefs.h
+++ b/chrome/browser/download/download_prefs.h
@@ -26,6 +26,12 @@ class PrefRegistrySyncable;
 // Stores all download-related preferences.
 class DownloadPrefs {
  public:
+  enum DOWNLOAD_RESTRICTION {
+    DOWNLOAD_RESTRICTION_NONE = 0,
+    DOWNLOAD_RESTRICTION_DANGEROUS_FILES = 1,
+    DOWNLOAD_RESTRICTION_POTENTIALLY_DANGEROUS_FILES = 2,
+    DOWNLOAD_RESTRICTION_ALL_FILES = 3,
+  };
   explicit DownloadPrefs(Profile* profile);
   ~DownloadPrefs();
 
@@ -49,6 +55,9 @@ class DownloadPrefs {
   base::FilePath SaveFilePath() const;
   void SetSaveFilePath(const base::FilePath& path);
   int save_file_type() const { return *save_file_type_; }
+  DOWNLOAD_RESTRICTION download_restriction() const {
+    return static_cast<DOWNLOAD_RESTRICTION>(*download_restriction_);
+  }
   void SetSaveFileType(int type);
 
   // Returns true if the prompt_for_download preference has been set and the
@@ -99,6 +108,7 @@ class DownloadPrefs {
   FilePathPrefMember download_path_;
   FilePathPrefMember save_file_path_;
   IntegerPrefMember save_file_type_;
+  IntegerPrefMember download_restriction_;
 
   // Set of file extensions to open at download completion.
   struct AutoOpenCompareFunctor {