Include referrer chain with inline install requests.

chrome/browser/extensions/webstore_data_fetcher.cc

Index: chrome/browser/extensions/webstore_data_fetcher.cc
diff --git a/chrome/browser/extensions/webstore_data_fetcher.cc b/chrome/browser/extensions/webstore_data_fetcher.cc
index c914ff374d5f8cc22053c54a6acd45b734dbdec0..2db75452da35451ba4795e4e07437030c93b8215 100644
--- a/chrome/browser/extensions/webstore_data_fetcher.cc
+++ b/chrome/browser/extensions/webstore_data_fetcher.cc
@@ -37,15 +37,26 @@ WebstoreDataFetcher::WebstoreDataFetcher(
 
 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(