Add support for subresource request loads in AppCache for the network service.

content/browser/appcache/appcache_url_loader_job.h

 // Copyright (c) 2017 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.
 
 #ifndef CONTENT_BROWSER_APPCACHE_APPCACHE_URL_LOADER_JOB_H_
 #define CONTENT_BROWSER_APPCACHE_APPCACHE_URL_LOADER_JOB_H_
 
 #include "base/logging.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "base/strings/string16.h"
 #include "base/time/time.h"
 #include "content/browser/appcache/appcache_entry.h"
 #include "content/browser/appcache/appcache_job.h"
+#include "content/browser/appcache/appcache_request_handler.h"
 #include "content/browser/appcache/appcache_response.h"
 #include "content/browser/appcache/appcache_storage.h"
 #include "content/browser/loader/url_loader_request_handler.h"
 #include "content/common/content_export.h"
 #include "content/public/common/resource_request.h"
 #include "content/public/common/url_loader.mojom.h"
+#include "mojo/public/cpp/bindings/associated_binding.h"
 #include "mojo/public/cpp/bindings/binding.h"
 #include "mojo/public/cpp/system/data_pipe.h"
 
 namespace content {
 
 class AppCacheRequest;
 class NetToMojoPendingBuffer;
+class URLLoaderFactoryGetter;
+struct SubresourceLoadInfo;
+
+// Holds information about the subresource load request like the routing id,
+// request id, the client pointer, etc.
+struct SubresourceLoadInfo {
+  SubresourceLoadInfo();
+  ~SubresourceLoadInfo();
+
+  mojom::URLLoaderAssociatedRequest url_loader_request;
+  int32_t routing_id;
+  int32_t request_id;
+  uint32_t options;
+  ResourceRequest request;
+  mojom::URLLoaderClientPtr client;
+  net::MutableNetworkTrafficAnnotationTag traffic_annotation;
+};
 
 // AppCacheJob wrapper for a mojom::URLLoader implementation which returns
 // responses stored in the AppCache.
 class CONTENT_EXPORT AppCacheURLLoaderJob : public AppCacheJob,
                                             public AppCacheStorage::Delegate,
                                             public mojom::URLLoader {
  public:
   ~AppCacheURLLoaderJob() override;
 
   // Sets up the bindings.
   void Start(mojom::URLLoaderRequest request, mojom::URLLoaderClientPtr client);
 
   // AppCacheJob overrides.
   void Kill() override;
   bool IsStarted() const override;
   void DeliverAppCachedResponse(const GURL& manifest_url,
                                 int64_t cache_id,
                                 const AppCacheEntry& entry,
                                 bool is_fallback) override;
   void DeliverNetworkResponse() override;
   void DeliverErrorResponse() override;
   const GURL& GetURL() const override;
   AppCacheURLLoaderJob* AsURLLoaderJob() override;
 
   // mojom::URLLoader implementation:
   void FollowRedirect() override;
   void SetPriority(net::RequestPriority priority,
                    int32_t intra_priority_value) override;
 
-  void set_loader_callback(LoaderCallback callback) {
-    loader_callback_ = std::move(callback);
+  void set_main_resource_loader_callback(LoaderCallback callback) {
+    main_resource_loader_callback_ = std::move(callback);
+  }
+
+  // Subresource request load information is passed in the
+  // |subresource_load_info| parameter. This includes the request id, the
+  // client pointer, etc.
+  // |default_url_loader| is used to retrieve the network loader for requests
+  // intended to be sent to the network.
+  void SetSubresourceLoadInfo(
+      std::unique_ptr<SubresourceLoadInfo> subresource_load_info,
+      URLLoaderFactoryGetter* default_url_loader);
+
+  // Ownership of the |handler| is transferred to us via this call. This is
+  // only for subresource requests.
+  void set_request_handler(std::unique_ptr<AppCacheRequestHandler> handler) {
+    handler_ = std::move(handler);
   }
 
  protected:
   // AppCacheJob::Create() creates this instance.
   friend class AppCacheJob;
 
   AppCacheURLLoaderJob(const ResourceRequest& request,
                        AppCacheStorage* storage);
 
   // AppCacheStorage::Delegate methods
@@ skipping 47 matching lines @@
   mojom::URLLoaderClientPtr client_info_;
 
   // mojo data pipe entities.
   mojo::ScopedDataPipeProducerHandle response_body_stream_;
 
   scoped_refptr<NetToMojoPendingBuffer> pending_write_;
 
   mojo::SimpleWatcher writable_handle_watcher_;
 
   // The Callback to be invoked in the network service land to indicate if
-  // the request can be serviced via the AppCache.
-  LoaderCallback loader_callback_;
+  // the main resource request can be serviced via the AppCache.
+  LoaderCallback main_resource_loader_callback_;
+
+  // We own the AppCacheRequestHandler instance for subresource requests.
+  std::unique_ptr<AppCacheRequestHandler> handler_;

[michaeln, 2017/07/11 00:14:58]

maybe calls this subresource_handler_ to make it more obvious it only applies
there

+
+  scoped_refptr<URLLoaderFactoryGetter> default_url_loader_factory_getter_;
+
+  // Holds subresource url loader information.
+  std::unique_ptr<SubresourceLoadInfo> subresource_load_info_;
+
+  // Timing information for the most recent request.  Its start times are
+  // populated in DeliverAppCachedResponse().
+  net::LoadTimingInfo load_timing_info_;
+
+  // Used for subresource requests which go to the network.
+  mojom::URLLoaderAssociatedPtr network_loader_request_;
+
+  // Binds the subresource URLLoaderClient with us. We can use the regular
+  // binding_ member above when we remove the need for the associated requests
+  // issue with URLLoaderFactory.
+  std::unique_ptr<mojo::AssociatedBinding<mojom::URLLoader>>
+      associated_binding_;
 
   DISALLOW_COPY_AND_ASSIGN(AppCacheURLLoaderJob);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_APPCACHE_APPCACHE_URL_LOADER_JOB_H_