Revert of Remove webkit's ResourceLoaderBridge interface.

webkit/child/resource_loader_bridge.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.
+//
+// The intent of this file is to provide a type-neutral abstraction between
+// Chrome and WebKit for resource loading. This pure-virtual interface is
+// implemented by the embedder.
+//
+// One of these objects will be created by WebKit for each request. WebKit
+// will own the pointer to the bridge, and will delete it when the request is
+// no longer needed.
+//
+// In turn, the bridge's owner on the WebKit end will implement the
+// RequestPeer interface, which we will use to communicate notifications
+// back.
+
+#ifndef WEBKIT_CHILD_RESOURCE_LOADER_BRIDGE_H_
+#define WEBKIT_CHILD_RESOURCE_LOADER_BRIDGE_H_
+
+#include "base/macros.h"
+#include "net/base/request_priority.h"
+#include "webkit/child/webkit_child_export.h"
+
+// TODO(pilgrim) remove this once resource loader is moved to content
+// http://crbug.com/338338
+namespace content {
+class RequestPeer;
+class ResourceRequestBody;
+struct SyncLoadResponse;
+}
+
+namespace webkit_glue {
+
+class ResourceLoaderBridge {
+ public:
+  // use WebKitPlatformSupportImpl::CreateResourceLoader() for construction, but
+  // anybody can delete at any time, INCLUDING during processing of callbacks.
+  WEBKIT_CHILD_EXPORT virtual ~ResourceLoaderBridge();
+
+  // Call this method before calling Start() to set the request body.
+  // May only be used with HTTP(S) POST requests.
+  virtual void SetRequestBody(content::ResourceRequestBody* request_body) = 0;
+
+  // Call this method to initiate the request.  If this method succeeds, then
+  // the peer's methods will be called asynchronously to report various events.
+  virtual bool Start(content::RequestPeer* peer) = 0;
+
+  // Call this method to cancel a request that is in progress.  This method
+  // causes the request to immediately transition into the 'done' state. The
+  // OnCompletedRequest method will be called asynchronously; this assumes
+  // the peer is still valid.
+  virtual void Cancel() = 0;
+
+  // Call this method to suspend or resume a load that is in progress.  This
+  // method may only be called after a successful call to the Start method.
+  virtual void SetDefersLoading(bool value) = 0;
+
+  // Call this method when the priority of the requested resource changes after
+  // Start() has been called.  This method may only be called after a successful
+  // call to the Start method.
+  virtual void DidChangePriority(net::RequestPriority new_priority,
+                                 int intra_priority_value) = 0;
+
+  // Call this method to load the resource synchronously (i.e., in one shot).
+  // This is an alternative to the Start method.  Be warned that this method
+  // will block the calling thread until the resource is fully downloaded or an
+  // error occurs.  It could block the calling thread for a long time, so only
+  // use this if you really need it!  There is also no way for the caller to
+  // interrupt this method.  Errors are reported via the status field of the
+  // response parameter.
+  virtual void SyncLoad(content::SyncLoadResponse* response) = 0;
+
+ protected:
+  // Construction must go through
+  // WebKitPlatformSupportImpl::CreateResourceLoader()
+  // For HTTP(S) POST requests, the AppendDataToUpload and AppendFileToUpload
+  // methods may be called to construct the body of the request.
+  WEBKIT_CHILD_EXPORT ResourceLoaderBridge();
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(ResourceLoaderBridge);
+};
+
+}  // namespace webkit_glue
+
+#endif  // WEBKIT_CHILD_RESOURCE_LOADER_BRIDGE_H_