2 files changed, 11 insertions, 1 deletions
diff --git a/content/browser/webui/web_ui_data_source_impl.cc b/content/browser/webui/web_ui_data_source_impl.cc
index b564e57..63e08bc 100644
--- a/content/browser/webui/web_ui_data_source_impl.cc
+++ b/content/browser/webui/web_ui_data_source_impl.cc
@@ -49,6 +49,9 @@ class WebUIDataSourceImpl::InternalDataSource : public URLDataSource {
     return parent_->StartDataRequest(path, render_process_id, render_view_id,
                                      callback);
   }
+  virtual bool ShouldReplaceExistingSource() const OVERRIDE {
+    return parent_->replace_existing_source_;
+  }
   virtual bool ShouldAddContentSecurityPolicy() const OVERRIDE {
     return parent_->add_csp_;
   }
@@ -81,7 +84,8 @@ WebUIDataSourceImpl::WebUIDataSourceImpl(const std::string& source_name)
       object_src_set_(false),
       frame_src_set_(false),
       deny_xframe_options_(true),
-      disable_set_font_strings_(false) {
+      disable_set_font_strings_(false),
+      replace_existing_source_(true) {
 }
 
 WebUIDataSourceImpl::~WebUIDataSourceImpl() {
@@ -134,6 +138,10 @@ void WebUIDataSourceImpl::SetRequestFilter(
   filter_callback_ = callback;
 }
 
+void WebUIDataSourceImpl::DisableReplaceExistingSource() {
+  replace_existing_source_ = false;
+}
+
 void WebUIDataSourceImpl::DisableContentSecurityPolicy() {
   add_csp_ = false;
 }
diff --git a/content/browser/webui/web_ui_data_source_impl.h b/content/browser/webui/web_ui_data_source_impl.h
index 0b6f8a3..1f81004 100644
--- a/content/browser/webui/web_ui_data_source_impl.h
+++ b/content/browser/webui/web_ui_data_source_impl.h
@@ -42,6 +42,7 @@ class CONTENT_EXPORT WebUIDataSourceImpl
   virtual void SetDefaultResource(int resource_id) OVERRIDE;
   virtual void SetRequestFilter(
       const WebUIDataSource::HandleRequestCallback& callback) OVERRIDE;
+  virtual void DisableReplaceExistingSource() OVERRIDE;
   virtual void DisableContentSecurityPolicy() OVERRIDE;
   virtual void OverrideContentSecurityPolicyObjectSrc(
       const std::string& data) OVERRIDE;
@@ -99,6 +100,7 @@ class CONTENT_EXPORT WebUIDataSourceImpl
   std::string frame_src_;
   bool deny_xframe_options_;
   bool disable_set_font_strings_;
+  bool replace_existing_source_;
 
   DISALLOW_COPY_AND_ASSIGN(WebUIDataSourceImpl);
 };