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

chrome/renderer/content_settings_observer_unittest.cc

Index: chrome/renderer/content_settings_observer_unittest.cc
diff --git a/chrome/renderer/content_settings_observer_unittest.cc b/chrome/renderer/content_settings_observer_unittest.cc
index 0588944f1acc75dc86f5e82d317518f1e82ddc41..4c2bfc812815fa3d3edba933ae7151d597e47028 100644
--- a/chrome/renderer/content_settings_observer_unittest.cc
+++ b/chrome/renderer/content_settings_observer_unittest.cc
@@ -30,6 +30,12 @@ TEST_F(ContentSettingsObserverTest, WhitelistedSchemes) {
       WebSecurityOrigin::create(chrome_dev_tools_url),
       GURL()));
 
+  GURL dom_distiller_url =
+      GURL(std::string(chrome::kDomDistillerScheme).append(end_url));
+  EXPECT_TRUE(ContentSettingsObserver::IsWhitelistedForContentSettings(
+      WebSecurityOrigin::create(dom_distiller_url),
+      GURL()));
+
   GURL extension_url =
       GURL(std::string(extensions::kExtensionScheme).append(end_url));
   EXPECT_TRUE(ContentSettingsObserver::IsWhitelistedForContentSettings(