Add the UMA PLT.BeginToFinish{,Doc}_AfterPreconnectRequest

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/public/platform/WebReferrerPolicy.h"
 #include "third_party/WebKit/public/platform/WebString.h"
 #include "third_party/WebKit/public/platform/WebURLRequest.h"
 #include "webkit/common/webkit_common_export.h"
 
 namespace webkit_glue {
 
 // Base class for Chrome's implementation of the "extra data" stored in each
 // ResourceRequest.
 class WEBKIT_COMMON_EXPORT WebURLRequestExtraDataImpl :
     public NON_EXPORTED_BASE(WebKit::WebURLRequest::ExtraData) {
  public:
+  static const int kType;
+
   // |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.
   explicit WebURLRequestExtraDataImpl(
       WebKit::WebReferrerPolicy referrer_policy,
       const WebKit::WebString& custom_user_agent);
   virtual ~WebURLRequestExtraDataImpl();
 
   WebKit::WebReferrerPolicy referrer_policy() const { return referrer_policy_; }
   const WebKit::WebString& custom_user_agent() const {
     return custom_user_agent_;
   }
+  int type_id() const { return type_id_; }

[jam, 2013/07/11 16:23:52]

hmm, seems best to avoid this hand rolled RTTI 

+
+ protected:
+  void set_type_id(int id) { type_id_ = id; }
 
  private:
   WebKit::WebReferrerPolicy referrer_policy_;
   WebKit::WebString custom_user_agent_;
 
+  // This is used to identify subclass of WebURLRequestExtraDataImpl.
+  int type_id_;
+
   DISALLOW_COPY_AND_ASSIGN(WebURLRequestExtraDataImpl);
 };
 
 }  // namespace webkit_glue
 
 #endif  // WEBKIT_GLUE_WEBURLREQUEST_EXTRADATA_IMPL_H_