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

chrome/browser/chrome_content_browser_client.cc

Index: chrome/browser/chrome_content_browser_client.cc
diff --git a/chrome/browser/chrome_content_browser_client.cc b/chrome/browser/chrome_content_browser_client.cc
index 83026ed3ce6842214ef186c65e50f4c0f73b8ea4..b16e0d5a12dcdaf3bff6d9d40416e43f8515dc4a 100644
--- a/chrome/browser/chrome_content_browser_client.cc
+++ b/chrome/browser/chrome_content_browser_client.cc
@@ -1048,6 +1048,13 @@ bool ChromeContentBrowserClient::ShouldUseProcessPerSite(
 void ChromeContentBrowserClient::GetAdditionalWebUISchemes(
     std::vector<std::string>* additional_schemes) {
   additional_schemes->push_back(chrome::kChromeSearchScheme);
+  additional_schemes->push_back(chrome::kDomDistillerScheme);
+}
+
+// It is allowed to view the source of these schemes.
+void ChromeContentBrowserClient::GetAdditionalSchemesForViewSource(
+    std::vector<std::string>* additional_schemes) {
+  additional_schemes->push_back(chrome::kDomDistillerScheme);
 }
 
 net::URLRequestContextGetter*