[Extensions] Allow shared resources between tests via _test_resources

extensions/browser/extension_protocols.h

Index: extensions/browser/extension_protocols.h
diff --git a/extensions/browser/extension_protocols.h b/extensions/browser/extension_protocols.h
index aff38b1caaa2b5aa9bf2de573fa3588dfd35207c..97a7e6071ff6115176f6d7a5e5d9a5fd13b902dd 100644
--- a/extensions/browser/extension_protocols.h
+++ b/extensions/browser/extension_protocols.h
@@ -8,20 +8,28 @@
 #include <memory>
 #include <string>
 
+#include "base/callback.h"
 #include "net/url_request/url_request_job_factory.h"
 
 namespace base {
+class FilePath;
 class Time;
 }
 
 namespace net {
+class URLRequest;
+class URLRequestJob;
 class HttpResponseHeaders;
 }
 
 namespace extensions {
-
 class InfoMap;
 
+using ExtensionProtocolTestHandler =
+    base::Callback<net::URLRequestJob*(net::URLRequest*,
+                                       net::NetworkDelegate*,
+                                       const base::FilePath&)>;
+
 // Builds HTTP headers for an extension request. Hashes the time to avoid
 // exposing the exact user installation time of the extension.
 net::HttpResponseHeaders* BuildHttpHeaders(
@@ -35,6 +43,11 @@ net::HttpResponseHeaders* BuildHttpHeaders(
 std::unique_ptr<net::URLRequestJobFactory::ProtocolHandler>
 CreateExtensionProtocolHandler(bool is_incognito, InfoMap* extension_info_map);
 
+// Allows tests to set a special handler for chrome-extension:// urls. Note
+// that this goes through all the normal security checks; it's essentially a
+// way to map extra resources to be included in extensions.
+void SetExtensionProtocolTestHandler(ExtensionProtocolTestHandler* handler);
+
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_EXTENSION_PROTOCOLS_H_