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

content/browser/service_worker/service_worker_provider_host.h

Index: content/browser/service_worker/service_worker_provider_host.h
diff --git a/content/browser/service_worker/service_worker_provider_host.h b/content/browser/service_worker/service_worker_provider_host.h
index f2ed389537b99cbe513b74dd77380e354a832b68..ad54f6c510dd4027d8e8654199a6dcd5c7789fa4 100644
--- a/content/browser/service_worker/service_worker_provider_host.h
+++ b/content/browser/service_worker/service_worker_provider_host.h
@@ -30,6 +30,7 @@
 #include "content/public/common/request_context_type.h"
 #include "content/public/common/resource_type.h"
 #include "mojo/public/cpp/bindings/associated_binding.h"
+#include "mojo/public/cpp/bindings/strong_associated_binding_set.h"
 
 namespace storage {
 class BlobStorageContext;
@@ -58,17 +59,23 @@ class WebContents;
 // For providers hosting a running service worker, this class will observe
 // resource loads made directly by the service worker.
 //
-// A ServiceWorkerProviderHost instance is created when a
-// ServiceWorkerNetworkProvider is created on the renderer process, which
-// happens 1) when a document or worker (i.e., a service worker client) is
-// created, or 2) during service worker startup. Mojo's connection from
-// ServiceWorkerNetworkProvider is established on the creation time, and the
-// instance is destroyed on disconnection from the renderer side.
-// If PlzNavigate is turned on, an instance is pre-created on the browser
+// A ServiceWorkerProviderHost is created in the following situations:
+// 1) When it's for a document or worker (i.e., a service
+// worker client), the provider host is created when
+// ServiceWorkerNetworkProvider is created on the renderer process. Mojo's
+// connection from ServiceWorkerNetworkProvider is established on the creation
+// time.
+// 2) When it's for a service worker context, the provider host is created on
+// the browser process before launching the service worker's thread. Mojo's
+// connection to the renderer is established with the StartWorker message.
+// 3) When PlzNavigate is turned on, an instance is pre-created on the browser
 // before ServiceWorkerNetworkProvider is created on the renderer because
 // navigation is initiated on the browser side. In that case, establishment of
 // Mojo's connection will be deferred until ServiceWorkerNetworkProvider is
 // created on the renderer.
+// Destruction of the ServiceWorkerProviderHost instance happens on
+// disconnection of the Mojo's pipe from the renderer side regardless of what
+// the provider is for.
 class CONTENT_EXPORT ServiceWorkerProviderHost
     : public NON_EXPORTED_BASE(ServiceWorkerRegistration::Listener),
       public base::SupportsWeakPtr<ServiceWorkerProviderHost>,
@@ -91,6 +98,13 @@ class CONTENT_EXPORT ServiceWorkerProviderHost
       bool are_ancestors_secure,
       const WebContentsGetter& web_contents_getter);
 
+  // Creates a ServiceWorkerProviderHost for hosting a running service worker.
+  // Information about the ServiceWorkerProviderHost is passed with the
+  // StartWorker message.
+  static std::unique_ptr<ServiceWorkerProviderHost> PreCreateForController(
+      ServiceWorkerVersion* hosted_version,
+      base::WeakPtr<ServiceWorkerContextCore> context);
+
   // Used to create a ServiceWorkerProviderHost when the renderer-side provider
   // is created. This ProviderHost will be created for the process specified by
   // |process_id|.
@@ -200,8 +214,6 @@ class CONTENT_EXPORT ServiceWorkerProviderHost
   // Clears the associated registration and stop listening to it.
   void DisassociateRegistration();
 
-  void SetHostedVersion(ServiceWorkerVersion* version);
-
   // Returns a handler for a request, the handler may return NULL if
   // the request doesn't require special handling.
   std::unique_ptr<ServiceWorkerRequestHandler> CreateRequestHandler(
@@ -270,6 +282,16 @@ class CONTENT_EXPORT ServiceWorkerProviderHost
       ServiceWorkerProviderHostInfo info,
       ServiceWorkerDispatcherHost* dispatcher_host);
 
+  // Completes initialization of provider hosts for controllers.
+  // This is called when a process for the service worker has already been
+  // allocated and EmbeddedWorkerInstance is about to send the StartWorker
+  // message. |out_provider_client_info| will be initialized by the values to
+  // create ServiceWorkerNetworkProvider on the renderer which will be connected
+  // to this instance.
+  virtual void CompleteStartWorkerPreparation(
+      int process_id,
+      mojom::ServiceWorkerProviderClientInfoPtr* out_provider_client_info);
+
   // Sends event messages to the renderer. Events for the worker are queued up
   // until the worker thread id is known via SetReadyToSendMessagesToWorker().
   void SendUpdateFoundMessage(
@@ -305,6 +327,12 @@ class CONTENT_EXPORT ServiceWorkerProviderHost
   void BindWorkerFetchContext(
       mojom::ServiceWorkerWorkerClientAssociatedPtrInfo client_ptr_info);
 
+ protected:
+  ServiceWorkerProviderHost(int process_id,
+                            ServiceWorkerProviderHostInfo info,
+                            base::WeakPtr<ServiceWorkerContextCore> context,
+                            ServiceWorkerDispatcherHost* dispatcher_host);
+
  private:
   friend class ForeignFetchRequestHandlerTest;
   friend class LinkHeaderServiceWorkerTest;
@@ -335,11 +363,6 @@ class CONTENT_EXPORT ServiceWorkerProviderHost
     ~OneShotGetReadyCallback();
   };
 
-  ServiceWorkerProviderHost(int process_id,
-                            ServiceWorkerProviderHostInfo info,
-                            base::WeakPtr<ServiceWorkerContextCore> context,
-                            ServiceWorkerDispatcherHost* dispatcher_host);
-
   // ServiceWorkerRegistration::Listener overrides.
   void OnVersionAttributesChanged(
       ServiceWorkerRegistration* registration,
@@ -373,6 +396,10 @@ class CONTENT_EXPORT ServiceWorkerProviderHost
   bool IsReadyToSendMessages() const;
   void Send(IPC::Message* message) const;
 
+  // Sets the version hosted by this provider. This method should be used only
+  // for provider hosts for controllers.
+  void SetHostedVersion(ServiceWorkerVersion* version);
+
   // Notifies the information about the controller and associated registration
   // to the provider on the renderer. This is for cross site transfer and
   // browser side navigation which need to decide which process will handle the