Add the scheme chrome-distiller:// and hook up data source.

chrome/renderer/content_settings_observer.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/renderer/content_settings_observer.h"
 
 #include "base/command_line.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/render_messages.h"
 #include "chrome/common/url_constants.h"
@@ skipping 341 matching lines @@
 
   if (origin.isUnique())
     return false;  // Uninitialized document?
 
   if (EqualsASCII(origin.protocol(), chrome::kChromeUIScheme))
     return true;  // Browser UI elements should still work.
 
   if (EqualsASCII(origin.protocol(), chrome::kChromeDevToolsScheme))
     return true;  // DevTools UI elements should still work.
 
+  if (EqualsASCII(origin.protocol(), chrome::kDomDistillerScheme))
+    return true;  // DOM Distiller viewer elements should still work.
+
   if (EqualsASCII(origin.protocol(), extensions::kExtensionScheme))
     return true;
 
   if (EqualsASCII(origin.protocol(), chrome::kChromeInternalScheme))
     return true;
 
   // TODO(creis, fsamuel): Remove this once the concept of swapped out
   // RenderViews goes away.
   if (document_url == GURL(content::kSwappedOutURL))
     return true;
 
   // If the scheme is file:, an empty file name indicates a directory listing,
   // which requires JavaScript to function properly.
   if (EqualsASCII(origin.protocol(), chrome::kFileScheme)) {
     return document_url.SchemeIs(chrome::kFileScheme) &&
            document_url.ExtractFileName().empty();
   }
 
   return false;
 }