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

chrome/renderer/chrome_content_renderer_client.cc

Index: chrome/renderer/chrome_content_renderer_client.cc
diff --git a/chrome/renderer/chrome_content_renderer_client.cc b/chrome/renderer/chrome_content_renderer_client.cc
index 729d91402087ce61e83ba89d4fb43149cc47f935..5d43af9df42b21655f788d6549a6fa3ad3e9d5e2 100644
--- a/chrome/renderer/chrome_content_renderer_client.cc
+++ b/chrome/renderer/chrome_content_renderer_client.cc
@@ -292,9 +292,10 @@ void ChromeContentRendererClient::RenderThreadStarted() {
   if (switches::IsNewProfileManagement())
     thread->RegisterExtension(extensions_v8::PrincipalsExtension::Get());
 
-  // chrome:, chrome-search:, and chrome-devtools: pages should not be
-  // accessible by normal content, and should also be unable to script anything
-  // but themselves (to help limit the damage that a corrupt page could cause).
+  // chrome:, chrome-search:, chrome-devtools:, and chrome-distiller: pages
+  // should not be accessible by normal content, and should also be unable to
+  // script anything but themselves (to help limit the damage that a corrupt
+  // page could cause).
   WebString chrome_ui_scheme(ASCIIToUTF16(chrome::kChromeUIScheme));
   WebSecurityPolicy::registerURLSchemeAsDisplayIsolated(chrome_ui_scheme);
 
@@ -307,6 +308,13 @@ void ChromeContentRendererClient::RenderThreadStarted() {
   WebString dev_tools_scheme(ASCIIToUTF16(chrome::kChromeDevToolsScheme));
   WebSecurityPolicy::registerURLSchemeAsDisplayIsolated(dev_tools_scheme);
 
+  if (CommandLine::ForCurrentProcess()->HasSwitch(

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

While this is technically correct, registering the scheme always as a display
isolated is not going to harm security. I doubt it will bring perf hit either,
so might as well do it all the time. This way you don't need to test for it when
the flag is passed.

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

Done.

+          switches::kEnableDomDistiller)) {
+    WebString dom_distiller_scheme(ASCIIToUTF16(chrome::kDomDistillerScheme));
+    // TODO(nyquist): Add test to ensure this happens when the flag is set.
+    WebSecurityPolicy::registerURLSchemeAsDisplayIsolated(dom_distiller_scheme);
+  }
+
 #if defined(OS_CHROMEOS)
   WebString drive_scheme(ASCIIToUTF16(chrome::kDriveScheme));
   WebSecurityPolicy::registerURLSchemeAsLocal(drive_scheme);