Make SyncLoad result handling pluggable

content/browser/loader/resource_dispatcher_host_impl.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This is the browser side of the resource dispatcher, it receives requests
 // from the child process (i.e. [Renderer, Plugin, Worker]ProcessHost), and
 // dispatches them to URLRequests. It then forwards the messages from the
 // URLRequests back to the correct process for handling.
 //
 // See http://dev.chromium.org/developers/design-documents/multi-process-resource-loading
 
 #ifndef CONTENT_BROWSER_LOADER_RESOURCE_DISPATCHER_HOST_IMPL_H_
 #define CONTENT_BROWSER_LOADER_RESOURCE_DISPATCHER_HOST_IMPL_H_
 
 #include <stdint.h>
 
 #include <map>
 #include <memory>
 #include <string>
 #include <vector>
 
+#include "base/callback_forward.h"
 #include "base/gtest_prod_util.h"
 #include "base/macros.h"
+#include "base/memory/ref_counted.h"
 #include "base/observer_list.h"
 #include "base/time/time.h"
 #include "base/timer/timer.h"
 #include "content/browser/download/save_types.h"
 #include "content/browser/loader/global_routing_id.h"
 #include "content/browser/loader/resource_loader.h"
 #include "content/browser/loader/resource_loader_delegate.h"
 #include "content/browser/loader/resource_scheduler.h"
 #include "content/common/content_export.h"
 #include "content/common/url_loader.mojom.h"
@@ skipping 43 matching lines @@
 class URLLoader;
 }  // namespace mojom
 
 using CreateDownloadHandlerIntercept =
     base::Callback<std::unique_ptr<ResourceHandler>(net::URLRequest*)>;
 
 class CONTENT_EXPORT ResourceDispatcherHostImpl
     : public ResourceDispatcherHost,
       public ResourceLoaderDelegate {
  public:
+  // Used to handle the result of SyncLoad IPC. |result| is null if it's
+  // unavailable due to an error.
+  using SyncLoadResultCallback =
+      base::Callback<void(const SyncLoadResult* result)>;
+
   // This constructor should be used if we want downloads to work correctly.
   // TODO(ananta)
   // Work on moving creation of download handlers out of
   // ResourceDispatcherHostImpl.
   ResourceDispatcherHostImpl(
       CreateDownloadHandlerIntercept download_handler_intercept);
   ResourceDispatcherHostImpl();
   ~ResourceDispatcherHostImpl() override;
 
   // Returns the current ResourceDispatcherHostImpl. May return NULL if it
@@ skipping 428 matching lines @@
   bool IsRequestIDInUse(const GlobalRequestID& id) const;
 
   // Update the ResourceRequestInfo and internal maps when a request is
   // transferred from one process to another.
   void UpdateRequestForTransfer(int child_id,
                                 int route_id,
                                 int request_id,
                                 const ResourceRequest& request_data,
                                 LoaderMap::iterator iter);
 
-  void BeginRequest(int request_id,
-                    const ResourceRequest& request_data,
-                    IPC::Message* sync_result,  // only valid for sync
-                    int route_id,               // only valid for async
-                    mojo::InterfaceRequest<mojom::URLLoader> mojo_request,
-                    mojom::URLLoaderClientPtr url_loader_client);
+  void BeginRequest(
+      int request_id,
+      const ResourceRequest& request_data,
+      const SyncLoadResultCallback& sync_result_handler, // only valid for sync
+      int route_id,                                      // only valid for async
+      mojo::InterfaceRequest<mojom::URLLoader> mojo_request,
+      mojom::URLLoaderClientPtr url_loader_client);
 
   // There are requests which need decisions to be made like the following:
   // Whether the presence of certain HTTP headers like the Origin header are
   // valid, etc. These requests may need to be aborted based on these
   // decisions which could be time consuming. We allow for these decisions
   // to be made asynchronously. The request proceeds when we hear back from
   // the interceptors about whether to continue or not.
   // The |continue_request| parameter in the function indicates whether the
   // request should be continued or aborted. The |error_code| parameter is set
   // if |continue_request| is false.
   void ContinuePendingBeginRequest(
       int request_id,
       const ResourceRequest& request_data,
-      IPC::Message* sync_result,  // only valid for sync
+      const SyncLoadResultCallback& sync_result_handler, // only valid for sync
       int route_id,
       const net::HttpRequestHeaders& headers,
       mojo::InterfaceRequest<mojom::URLLoader> mojo_request,
       mojom::URLLoaderClientPtr url_loader_client,
       bool continue_request,
       int error_code);
 
   // Creates a ResourceHandler to be used by BeginRequest() for normal resource
   // loading.
   std::unique_ptr<ResourceHandler> CreateResourceHandler(
       net::URLRequest* request,
       const ResourceRequest& request_data,
-      IPC::Message* sync_result,
+      const SyncLoadResultCallback& sync_result_handler,
       int route_id,
       int process_type,
       int child_id,
       ResourceContext* resource_context,
       mojo::InterfaceRequest<mojom::URLLoader> mojo_request,
       mojom::URLLoaderClientPtr url_loader_client);
 
   // Wraps |handler| in the standard resource handlers for normal resource
   // loading and navigation requests. This adds MimeTypeResourceHandler and
   // ResourceThrottles.
@@ skipping 171 matching lines @@
 
   // Points to the registered download handler intercept.
   CreateDownloadHandlerIntercept create_download_handler_intercept_;
 
   DISALLOW_COPY_AND_ASSIGN(ResourceDispatcherHostImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_LOADER_RESOURCE_DISPATCHER_HOST_IMPL_H_