Add chrome-search: access from Instant overlay

content/public/browser/url_data_source.h

Index: content/public/browser/url_data_source.h
diff --git a/content/public/browser/url_data_source.h b/content/public/browser/url_data_source.h
index 7d8847cf0e3ff9853bbd999934e6c9a768b17e98..fbb8eaf6ea50d9195b307397d6b2bc8e9e79b415 100644
--- a/content/public/browser/url_data_source.h
+++ b/content/public/browser/url_data_source.h
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef CONTENT_PUBLIC_BROWSER_URL_DATA_SOURCE_DELEGATE_H_
-#define CONTENT_PUBLIC_BROWSER_URL_DATA_SOURCE_DELEGATE_H_
+#ifndef CONTENT_PUBLIC_BROWSER_URL_DATA_SOURCE_H_
+#define CONTENT_PUBLIC_BROWSER_URL_DATA_SOURCE_H_
 
 #include <string>
 
@@ -16,6 +16,10 @@ namespace base {
 class RefCountedMemory;
 }
 
+namespace net {
+class URLRequest;
+}
+
 namespace content {
 class BrowserContext;
 
@@ -95,8 +99,13 @@ class CONTENT_EXPORT URLDataSource {
   // By default, the "X-Frame-Options: DENY" header is sent. To stop this from
   // happening, return false. It is OK to return false as needed.
   virtual bool ShouldDenyXFrameOptions() const;
+
+  // By default, only chrome: and chrome-devtools: requests are allowed.
+  // Override in specific data sources to enable for additional schemes or to
+  // implement fancier access control.
+  virtual bool ShouldServiceRequest(const net::URLRequest* request) const;
 };
 
 }  // namespace content
 
-#endif  // CONTENT_PUBLIC_BROWSER_URL_DATA_SOURCE_DELEGATE_H_
+#endif  // CONTENT_PUBLIC_BROWSER_URL_DATA_SOURCE_H_