rebaseline_server: add download link for SKP diff patchfile

gm/rebaseline_server/static/live-loader.js

 /*
  * Loader:
  * Reads GM result reports written out by results.py, and imports
  * them into $scope.extraColumnHeaders and $scope.imagePairs .
  */
 var Loader = angular.module(
     'Loader',
     ['ConstantsModule']
 );
 
+// This configuration is needed to allow downloads of the diff patch.
+// See https://github.com/angular/angular.js/issues/3889
+Loader.config(['$compileProvider', function($compileProvider) {
+  $compileProvider.aHrefSanitizationWhitelist(/^\s*(https?|ftp|file|blob):/);
+}]);
+
 Loader.directive(
   'resultsUpdatedCallbackDirective',
   ['$timeout',
    function($timeout) {
      return function(scope, element, attrs) {
        if (scope.$last) {
          $timeout(function() {
            scope.resultsUpdatedCallback();
          });
        }
@@ skipping 813 matching lines @@
       modificationData[constants.KEY__LIVE_EDITS__SET_A_DESCRIPTIONS] =
           $scope.header[constants.KEY__HEADER__SET_A_DESCRIPTIONS];
       modificationData[constants.KEY__LIVE_EDITS__SET_B_DESCRIPTIONS] =
           $scope.header[constants.KEY__HEADER__SET_B_DESCRIPTIONS];
       $http({
         method: "POST",
         url: "/live-edits",
         data: modificationData
       }).success(function(data, status, headers, config) {
         $scope.diffResults = data;
+        var blob = new Blob([$scope.diffResults], {type: 'text/plain'});
+        $scope.diffResultsBlobUrl = window.URL.createObjectURL(blob);
         $scope.submitPending = false;
       }).error(function(data, status, headers, config) {
         alert("There was an error submitting your baselines.\n\n" +
             "Please see server-side log for details.");
         $scope.submitPending = false;
       });
     };
 
 
     //
@@ skipping 153 matching lines @@
      *
      * TODO(epoger): It might be nice to tint the color when it's not completely
      * black or completely white.
      */
     $scope.brightnessStringToHexColor = function(brightnessString) {
       var v = parseInt(brightnessString);
       return $scope.hexColorString(v, v, v);
     };
   }
 );