Reduce/remove usage of BrowserThread in content/browser/loader.

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/single_thread_task_runner.h"
 #include "base/time/time.h"
 #include "content/browser/loader/global_routing_id.h"
 #include "content/browser/loader/resource_loader_delegate.h"
 #include "content/common/content_export.h"
 #include "content/common/url_loader.mojom.h"
 #include "content/public/browser/global_request_id.h"
 #include "content/public/browser/resource_dispatcher_host.h"
 #include "content/public/browser/resource_request_info.h"
 #include "content/public/common/previews_state.h"
 #include "content/public/common/request_context_type.h"
@@ skipping 47 matching lines @@
   // 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);
+      CreateDownloadHandlerIntercept download_handler_intercept,
+      const scoped_refptr<base::SingleThreadTaskRunner>& io_thread_runner);
   ResourceDispatcherHostImpl();
   ~ResourceDispatcherHostImpl() override;
 
   // Returns the current ResourceDispatcherHostImpl. May return NULL if it
   // hasn't been created yet.
   static ResourceDispatcherHostImpl* Get();
 
   // ResourceDispatcherHost implementation:
   void SetDelegate(ResourceDispatcherHostDelegate* delegate) override;
   void SetAllowCrossOriginAuthPrompt(bool value) override;
@@ skipping 216 matching lines @@
   // Creates a new request ID for browser initiated requests. See the comments
   // of |request_id_| for the details. Must be called on the IO thread.
   int MakeRequestID();
 
   // Cancels a request as requested by a renderer. This function is called when
   // a mojo connection is lost.
   // Note that this cancel is subtly different from the other CancelRequest
   // methods in this file, which also tear down the loader.
   void CancelRequestFromRenderer(GlobalRequestID request_id);
 
+  scoped_refptr<base::SingleThreadTaskRunner> io_thread_task_runner() const {
+    return io_thread_task_runner_;
+  }
+
+  scoped_refptr<base::SingleThreadTaskRunner> main_thread_task_runner() const {
+    return main_thread_task_runner_;
+  }
+
  private:
   friend class ResourceDispatcherHostTest;
 
   FRIEND_TEST_ALL_PREFIXES(ResourceDispatcherHostTest,
                            TestBlockedRequestsProcessDies);
   FRIEND_TEST_ALL_PREFIXES(ResourceDispatcherHostTest,
                            CalculateApproximateMemoryCost);
   FRIEND_TEST_ALL_PREFIXES(ResourceDispatcherHostTest,
                            DetachableResourceTimesOut);
   FRIEND_TEST_ALL_PREFIXES(ResourceDispatcherHostTest,
@@ skipping 409 matching lines @@
   DelegateMap delegate_map_;
 
   std::unique_ptr<ResourceScheduler> scheduler_;
 
   // Used to invoke an interceptor for the HTTP header.
   HeaderInterceptorMap http_header_interceptor_map_;
 
   // Points to the registered download handler intercept.
   CreateDownloadHandlerIntercept create_download_handler_intercept_;
 
+  // Task runner for the main thread.
+  scoped_refptr<base::SingleThreadTaskRunner> main_thread_task_runner_;
+
+  // Task runner for the IO thead.
+  scoped_refptr<base::SingleThreadTaskRunner> io_thread_task_runner_;
+
   DISALLOW_COPY_AND_ASSIGN(ResourceDispatcherHostImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_LOADER_RESOURCE_DISPATCHER_HOST_IMPL_H_