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

chrome/browser/content_settings/host_content_settings_map.cc

Index: chrome/browser/content_settings/host_content_settings_map.cc
diff --git a/chrome/browser/content_settings/host_content_settings_map.cc b/chrome/browser/content_settings/host_content_settings_map.cc
index 90f13403f0e92fffed313877a5cda1fea6c43e83..ba66b9c0f7445c47f37c5bac4fdedb456929c6a9 100644
--- a/chrome/browser/content_settings/host_content_settings_map.cc
+++ b/chrome/browser/content_settings/host_content_settings_map.cc
@@ -554,6 +554,7 @@ bool HostContentSettingsMap::ShouldAllowAllContent(
     }
   }
   return primary_url.SchemeIs(chrome::kChromeDevToolsScheme) ||
+         primary_url.SchemeIs(chrome::kDomDistillerScheme) ||

[nasko, 2014/01/16 23:39:12]

I'm not sure if we need to exempt the scheme from content settings. If I
understand the feature correctly, we will strip down the DOM to the simplest
form and display that. This is not Chrome internal content, rather untrusted
data from the web, we don't need to exempt this content from content settings.

nit: please keep this in alphabetical order, since most other places where the
schemes appear do it.

[nyquist, 2014/01/22 00:47:58]

Removed.

          primary_url.SchemeIs(chrome::kChromeUIScheme);
 }