Pepper: Add a X-Requested-With header to URL requests done for Pepper plugins.

webkit/glue/weburlrequest_extradata_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.
 
 #ifndef WEBKIT_GLUE_WEBURLREQUEST_EXTRADATA_IMPL_H_
 #define WEBKIT_GLUE_WEBURLREQUEST_EXTRADATA_IMPL_H_
 
 #include "base/compiler_specific.h"
 #include "third_party/WebKit/Source/Platform/chromium/public/WebReferrerPolicy.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/platform/WebString.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/platform/WebURLRequest.h"
 #include "webkit/glue/webkit_glue_export.h"
 
 namespace webkit_glue {
 
 // Base class for Chrome's implementation of the "extra data" stored in each
 // ResourceRequest.
 class WEBKIT_GLUE_EXPORT WebURLRequestExtraDataImpl :
     NON_EXPORTED_BASE(public WebKit::WebURLRequest::ExtraData) {
  public:
   // |custom_user_agent| is used to communicate an overriding custom user agent
   // to |RenderViewImpl::willSendRequest()|; set to a null string to indicate no
   // override and an empty string to indicate that there should be no user
-  // agent. This needs to be here, instead of content's |RequestExtraData| since
-  // ppb_url_request_info_impl.cc needs to be able to set it.
+  // agent. |requested_with| is used to set a X-Requested-With header for
+  // requests done on behalf of plugins. These need to be here, instead of
+  // content's |RequestExtraData| since they're set from webkit/plugins/ppapi.
   explicit WebURLRequestExtraDataImpl(
       WebKit::WebReferrerPolicy referrer_policy,
-      const WebKit::WebString& custom_user_agent);
+      const WebKit::WebString& custom_user_agent,
+      const WebKit::WebString& requested_with);
   virtual ~WebURLRequestExtraDataImpl();
 
   WebKit::WebReferrerPolicy referrer_policy() const { return referrer_policy_; }
   const WebKit::WebString& custom_user_agent() const {
     return custom_user_agent_;
   }
+  const WebKit::WebString& requested_with() const { return requested_with_; }
 
  private:
   WebKit::WebReferrerPolicy referrer_policy_;
   WebKit::WebString custom_user_agent_;
+  WebKit::WebString requested_with_;
 
   DISALLOW_COPY_AND_ASSIGN(WebURLRequestExtraDataImpl);
 };
 
 }  // namespace webkit_glue
 
 #endif  // WEBKIT_GLUE_WEBURLREQUEST_EXTRADATA_IMPL_H_