Implement dumb URLLoader{Factory} for ServiceWorker script loading

content/common/service_worker/service_worker_provider.mojom

Index: content/common/service_worker/service_worker_provider.mojom
diff --git a/content/common/service_worker/service_worker_provider.mojom b/content/common/service_worker/service_worker_provider.mojom
index 66afc9b6a71881fd22ee843073bb7f33fc8efa16..deec1ce2e11ed9b38f9bfca845e0f7ccaffa84fb 100644
--- a/content/common/service_worker/service_worker_provider.mojom
+++ b/content/common/service_worker/service_worker_provider.mojom
@@ -6,6 +6,7 @@ module content.mojom;
 
 import "content/common/service_worker/service_worker_provider_interfaces.mojom";
 import "content/common/service_worker/service_worker_types.mojom";
+import "content/common/url_loader_factory.mojom";
 
 // A container object carried from the browser to the renderer process.
 // This contains the params for the constructor of ServiceWorkerNetworkProvider.
@@ -21,6 +22,7 @@ struct ServiceWorkerProviderClientInfo {
 
   associated ServiceWorkerProviderHost host_ptr_info;
   associated ServiceWorkerProvider& client_request;
+  associated URLLoaderFactory script_loader_factory_ptr_info;

[shimazu, 2017/06/16 04:45:07]

Should it be associated with EmbeddedWorkerInstanceClient? 
I assume it's fine to use an isolated pipe because the loader's IPCs are
originally async and other logics don't rely on the order of IPCs.

// I'm not strongly confident of it, so sorry if I missed something!

[kinuko, 2017/06/16 09:15:15]

At some point I think we can make this independent, but for now it seems it'd be
safer to keep ordering with, say, OnScriptLoaded etc?

 };
 
 // A container object carried from the renderer to the browser process.
@@ -34,4 +36,4 @@ struct ServiceWorkerProviderHostInfo {
   bool is_parent_frame_secure;
   associated ServiceWorkerProviderHost& host_request;
   associated ServiceWorkerProvider client_ptr_info;
-};
+};