Include referrer chain with inline install requests.

chrome/browser/extensions/webstore_data_fetcher.cc

 // Copyright 2013 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.
 
 #include "chrome/browser/extensions/webstore_data_fetcher.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/values.h"
@@ skipping 19 matching lines @@
     const std::string webstore_item_id)
     : delegate_(delegate),
       request_context_(request_context),
       referrer_url_(referrer_url),
       id_(webstore_item_id),
       max_auto_retries_(0) {
 }
 
 WebstoreDataFetcher::~WebstoreDataFetcher() {}
 
+void WebstoreDataFetcher::SetJsonPostData(std::unique_ptr<std::string> json) {
+  json_post_data_.swap(*json);

[Devlin, 2017/01/27 20:31:34]

If we always dereference this, why pass it as a unique ptr?

[robertshield, 2017/01/28 03:58:48]

Indeed, simplified.

+}
+
 void WebstoreDataFetcher::Start() {
   GURL webstore_data_url(extension_urls::GetWebstoreItemJsonDataURL(id_));
-
+  net::URLFetcher::RequestType request_type =
+      json_post_data_.empty() ? net::URLFetcher::GET : net::URLFetcher::POST;
   webstore_data_url_fetcher_ =
-      net::URLFetcher::Create(webstore_data_url, net::URLFetcher::GET, this);
+      net::URLFetcher::Create(webstore_data_url, request_type, this);
   webstore_data_url_fetcher_->SetRequestContext(request_context_);
   webstore_data_url_fetcher_->SetReferrer(referrer_url_.spec());
   webstore_data_url_fetcher_->SetLoadFlags(net::LOAD_DO_NOT_SAVE_COOKIES |
                                            net::LOAD_DISABLE_CACHE);
+
+  if (!json_post_data_.empty()) {
+    webstore_data_url_fetcher_->SetUploadData("application/json",
+                                              json_post_data_);
+  }
+
   if (max_auto_retries_ > 0) {
     webstore_data_url_fetcher_->SetMaxRetriesOn5xx(max_auto_retries_);
     webstore_data_url_fetcher_->SetAutomaticallyRetryOnNetworkChanges(
         max_auto_retries_);
   }
   webstore_data_url_fetcher_->Start();
 }
 
 void WebstoreDataFetcher::OnJsonParseSuccess(
     std::unique_ptr<base::Value> parsed_json) {
@@ skipping 28 matching lines @@
   fetcher->GetResponseAsString(&webstore_json_data);
 
   // The parser will call us back via one of the callbacks.
   safe_json::SafeJsonParser::Parse(
       webstore_json_data,
       base::Bind(&WebstoreDataFetcher::OnJsonParseSuccess, AsWeakPtr()),
       base::Bind(&WebstoreDataFetcher::OnJsonParseFailure, AsWeakPtr()));
 }
 
 }  // namespace extensions