Add a ResourceScheduler to ResourceDispatcherHost.

webkit/tools/test_shell/simple_resource_loader_bridge.cc

Index: webkit/tools/test_shell/simple_resource_loader_bridge.cc
diff --git a/webkit/tools/test_shell/simple_resource_loader_bridge.cc b/webkit/tools/test_shell/simple_resource_loader_bridge.cc
index de1f47402cd30d744338570ad675781b9e2c4bdd..2faa2b7474e38817b180fdaac596df47d6ea5c99 100644
--- a/webkit/tools/test_shell/simple_resource_loader_bridge.cc
+++ b/webkit/tools/test_shell/simple_resource_loader_bridge.cc
@@ -967,6 +967,10 @@ class ResourceLoaderBridgeImpl : public ResourceLoaderBridge {
     static_cast<SyncRequestProxy*>(proxy_)->WaitForCompletion();
   }
 
+  virtual void DidChangePriority(net::RequestPriority new_priority) {
+    // Not really needed for DRT.
+  }
+
  private:
   // Ownership of params_ is transfered to the proxy when the proxy is created.
   scoped_ptr<RequestParams> params_;