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

content/browser/browser_url_handler_impl.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 "content/browser/browser_url_handler_impl.h"
 
 #include "base/command_line.h"
 #include "base/strings/string_util.h"
 #include "content/browser/frame_host/debug_urls.h"
 #include "content/browser/webui/web_ui_impl.h"
@@ skipping 19 matching lines @@
     };
 
     bool is_sub_scheme_allowed = false;
     for (size_t i = 0; i < arraysize(allowed_sub_schemes); i++) {
       if (url->SchemeIs(allowed_sub_schemes[i])) {
         is_sub_scheme_allowed = true;
         break;
       }
     }
 
+    // If none of the default allowed schemes match, try with additional schemes
+    // from the ContentClient.
+    if (!is_sub_scheme_allowed) {
+      std::vector<std::string> additional_schemes;
+      GetContentClient()->browser()->GetAdditionalSchemesForViewSource(

[jam, 2014/01/24 22:07:55]

actually, now that I think about it some more, it seems reasonable that we call
GetAdditionalWebUISchemes here and then we don't need
GetAdditionalSchemesForViewSource at all. then you can create a vector and stick
allowed_sub_schemes in them and also the result of GetAdditionalWebUISchemes, so
that this small for loop below doesn't need to be duplicated as well

[nyquist, 2014/01/25 00:40:38]

Done.

One note: this adds chrome::kChromeSearchScheme to the list of schemes for which
view-source is allowed.

+          &additional_schemes);
+      for (size_t i = 0; i < additional_schemes.size(); ++i) {
+        if (url->SchemeIs(additional_schemes[i].c_str())) {
+          is_sub_scheme_allowed = true;
+          break;
+        }
+      }
+    }
+
     if (!is_sub_scheme_allowed) {
       *url = GURL(kAboutBlankURL);
       return false;
     }
 
     return true;
   }
   return false;
 }
 
@@ skipping 89 matching lines @@
           return true;
       } else if (handler(&test_url, browser_context)) {
         return reverse_rewriter(url, browser_context);
       }
     }
   }
   return false;
 }
 
 }  // namespace content