Add Resource Handler for creating Streams to forward to extensions

content/public/browser/resource_dispatcher_host_delegate.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.
 
 #ifndef CONTENT_PUBLIC_BROWSER_RESOURCE_DISPATCHER_HOST_DELEGATE_H_
 #define CONTENT_PUBLIC_BROWSER_RESOURCE_DISPATCHER_HOST_DELEGATE_H_
 
 #include <string>
 
 #include "base/basictypes.h"
+#include "base/memory/scoped_ptr.h"
 #include "content/common/content_export.h"
 #include "webkit/glue/resource_type.h"
 
 class GURL;
 template <class T> class ScopedVector;
 
 namespace appcache {
 class AppCacheService;
 }
 
 namespace content {
 class ResourceContext;
 class ResourceThrottle;
+class StreamHandle;
 struct Referrer;
 struct ResourceResponse;
 }
 
 namespace IPC {
 class Sender;
 }
 
 namespace net {
 class AuthChallengeInfo;
@@ skipping 66 matching lines @@
   // guarantee that the app successfully handled it.
   virtual bool HandleExternalProtocol(const GURL& url,
                                       int child_id,
                                       int route_id);
 
   // Returns true if we should force the given resource to be downloaded.
   // Otherwise, the content layer decides.
   virtual bool ShouldForceDownloadResource(
       const GURL& url, const std::string& mime_type);
 
+  // Returns true and sets |security_origin| and |target_id| if a Stream should
+  // be created for the resource.
+  // If true is returned, a new Stream will be created and OnStreamCreated will
+  // be called with the |target_id| returned by this function and a URL to read
+  // the Stream which is accessible from the |security_origin| returned by this
+  // function.
+  virtual bool ShouldInterceptResourceAsStream(
+      content::ResourceContext* resource_context,
+      const GURL& url,
+      const std::string& mime_type,
+      GURL* security_origin,
+      std::string* target_id);
+
+  // Informs the delegate that a stream was created. |target_id| will be filled
+  // with the parameter returned by ShouldInterceptResourceAsStream(). The
+  // Stream can be read from the blob URL owned by |stream|, but can only be
+  // read once.
+  virtual void OnStreamCreated(
+      content::ResourceContext* resource_context,
+      int render_process_id,
+      int render_view_id,
+      const std::string& target_id,
+      scoped_ptr<StreamHandle> stream);
+
   // Informs the delegate that a response has started.
   virtual void OnResponseStarted(
       net::URLRequest* request,
       ResourceContext* resource_context,
       ResourceResponse* response,
       IPC::Sender* sender);
 
   // Informs the delegate that a request has been redirected.
   virtual void OnRequestRedirected(
       const GURL& redirect_url,
       net::URLRequest* request,
       ResourceContext* resource_context,
       ResourceResponse* response);
 
  protected:
   ResourceDispatcherHostDelegate();
   virtual ~ResourceDispatcherHostDelegate();
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_RESOURCE_DISPATCHER_HOST_DELEGATE_H_