override chrome:// URLs via extensions.

chrome/common/extensions/extension.cc

 // Copyright (c) 2009 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 "chrome/common/extensions/extension.h"
 
 #include "app/resource_bundle.h"
 #include "base/basictypes.h"
 #include "base/file_path.h"
 #include "base/file_util.h"
@@ skipping 979 matching lines @@
     std::string default_locale;
     if (!source.GetString(keys::kDefaultLocale, &default_locale)) {
       *error = errors::kInvalidDefaultLocale;
       return false;
     }
     // Normalize underscores to hyphens.
     std::replace(default_locale.begin(), default_locale.end(), '_', '-');
     set_default_locale(default_locale);
   }
 
+  // Chrome URL overrides (optional)
+  if (source.HasKey(keys::kChromeURLOverrides)) {
+    DictionaryValue* overrides;
+    if (!source.GetDictionary(keys::kChromeURLOverrides, &overrides)) {
+      *error = errors::kInvalidChromeURLOverrides;
+      return false;
+    }
+    // Validate that the overrides are all strings
+    DictionaryValue::key_iterator iter = overrides->begin_keys();
+    while (iter != overrides->end_keys()) {
+      // For now, only allow the new tab page.  Others will work when we remove
+      // this check, but let's keep it simple for now.
+      // TODO(erikkay) enable other pages as well
+      if (WideToUTF8(*iter) != chrome::kChromeUINewTabHost) {
+        *error = errors::kInvalidChromeURLOverrides;
+        return false;
+      }
+      std::string val;
+      if (!overrides->GetString(*iter, &val)) {
+        *error = errors::kInvalidChromeURLOverrides;
+        return false;
+      }
+      // Replace the entry with a fully qualified chrome-extension:// URL.
+      GURL url = GetResourceURL(val);
+      overrides->SetString(*iter, url.spec());
+      ++iter;
+    }
+    chrome_url_overrides_.reset(
+        static_cast<DictionaryValue*>(overrides->DeepCopy()));
+  }
+
   return true;
 }
 
 std::set<FilePath> Extension::GetBrowserImages() {
   std::set<FilePath> image_paths;
 
   // extension icons
   for (std::map<int, std::string>::iterator iter = icons_.begin();
        iter != icons_.end(); ++iter) {
     image_paths.insert(FilePath::FromWStringHack(UTF8ToWide(iter->second)));
@@ skipping 75 matching lines @@
     UserScript::PatternList::const_iterator pattern =
         content_script->url_patterns().begin();
     for (; pattern != content_script->url_patterns().end(); ++pattern) {
       if (pattern->match_subdomains() && pattern->host().empty())
         return true;
     }
   }
 
   return false;
 }