Implement dumb URLLoader{Factory} for ServiceWorker script loading (for try)

content/browser/service_worker/embedded_worker_instance.h

Index: content/browser/service_worker/embedded_worker_instance.h
diff --git a/content/browser/service_worker/embedded_worker_instance.h b/content/browser/service_worker/embedded_worker_instance.h
index 737417c88ce30130b965a300a4ade9502c079d02..6952ab9fa9f12b65baf29ea501b48bc269be70ab 100644
--- a/content/browser/service_worker/embedded_worker_instance.h
+++ b/content/browser/service_worker/embedded_worker_instance.h
@@ -43,6 +43,7 @@ namespace content {
 class EmbeddedWorkerRegistry;
 struct EmbeddedWorkerStartParams;
 class ServiceWorkerContextCore;
+class ServiceWorkerProviderHost;
 
 // This gives an interface to control one EmbeddedWorker instance, which
 // may be 'in-waiting' or running in one of the child processes added by
@@ -108,8 +109,10 @@ class CONTENT_EXPORT EmbeddedWorkerInstance
   // STOPPED status. |callback| is invoked after the worker script has been
   // started and evaluated, or when an error occurs.
   // |params| should be populated with service worker version info needed
-  // to start the worker.
+  // to start the worker. |provider_host| is a pre-created host for the
+  // controller.
   void Start(std::unique_ptr<EmbeddedWorkerStartParams> params,
+             base::WeakPtr<ServiceWorkerProviderHost> provider_host,
              mojom::ServiceWorkerEventDispatcherRequest dispatcher_request,
              const StatusCallback& callback);
 
@@ -228,7 +231,7 @@ class CONTENT_EXPORT EmbeddedWorkerInstance
   void OnScriptLoaded() override;
   // Notifies the corresponding provider host that the thread has started and is
   // ready to receive messages.
-  void OnThreadStarted(int thread_id, int provider_id) override;
+  void OnThreadStarted(int thread_id) override;
   void OnScriptLoadFailed() override;
   // Fires the callback passed to Start().
   void OnScriptEvaluated(bool success) override;
@@ -283,7 +286,10 @@ class CONTENT_EXPORT EmbeddedWorkerInstance
   std::unique_ptr<EmbeddedWorkerInstance::WorkerProcessHandle> process_handle_;
   int thread_id_;
 
-  // |client_| is used to send messages to the renderer process.
+  // |client_| is used to send messages to the renderer process. The browser
+  // process should not disconnect the pipe because other associated interfaces
+  // may be using it. The renderer process will disconnect the pipe when
+  // appropriate.
   mojom::EmbeddedWorkerInstanceClientPtr client_;
 
   // Binding for EmbeddedWorkerInstanceHost, runs on IO thread.
@@ -293,6 +299,9 @@ class CONTENT_EXPORT EmbeddedWorkerInstance
   // a mojo struct.
   mojom::ServiceWorkerEventDispatcherRequest pending_dispatcher_request_;
 
+  // The provider host that is hosting this running worker.
+  base::WeakPtr<ServiceWorkerProviderHost> provider_host_;
+
   // Whether devtools is attached or not.
   bool devtools_attached_;