[Extensions] Allow shared resources between tests via _test_resources

extensions/browser/extension_protocols.cc

Index: extensions/browser/extension_protocols.cc
diff --git a/extensions/browser/extension_protocols.cc b/extensions/browser/extension_protocols.cc
index c231083a1b2533c7e094c3d88a128a4ff3f8db8d..5efe573b5b089d4cfecbaa7423b66422cd92d3fb 100644
--- a/extensions/browser/extension_protocols.cc
+++ b/extensions/browser/extension_protocols.cc
@@ -73,6 +73,8 @@ using extensions::SharedModuleInfo;
 namespace extensions {
 namespace {
 
+ExtensionProtocolTestHandler* g_test_handler = nullptr;
+
 class GeneratedBackgroundPageJob : public net::URLRequestSimpleJob {
  public:
   GeneratedBackgroundPageJob(net::URLRequest* request,
@@ -523,6 +525,14 @@ ExtensionProtocolHandler::MaybeCreateJob(
       return NULL;
     }
   }
+
+  if (g_test_handler) {
+    net::URLRequestJob* test_job =
+        g_test_handler->Run(request, network_delegate, relative_path);
+    if (test_job)
+      return test_job;
+  }
+
   ContentVerifyJob* verify_job = NULL;
   ContentVerifier* verifier = extension_info_map_->content_verifier();
   if (verifier) {
@@ -590,4 +600,8 @@ CreateExtensionProtocolHandler(bool is_incognito,
                                                     extension_info_map);
 }
 
+void SetExtensionProtocolTestHandler(ExtensionProtocolTestHandler* handler) {
+  g_test_handler = handler;
+}
+
 }  // namespace extensions