[Extensions] Add a referrer to the url for reporting extension abuse

Add a referrer to the url that we use to report abuse from the extension
uninstall dialog so that we can track its usage separately.

BUG=510618

Review URL: https://codereview.chromium.org/1237313003

Cr-Commit-Position: refs/heads/master@{#338950}

1 files changed, 6 insertions, 2 deletions

diff --git a/extensions/common/extension_urls.cc b/extensions/common/extension_urls.cc
index c4215bc..08fb32d 100644
--- a/extensions/common/extension_urls.cc
+++ b/extensions/common/extension_urls.cc
@@ -5,6 +5,7 @@
 #include "extensions/common/extension_urls.h"
 
 #include "base/strings/string_util.h"
+#include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
 #include "extensions/common/constants.h"
 #include "extensions/common/extensions_client.h"
@@ -71,8 +72,11 @@ GURL GetWebstoreUpdateUrl() {
   return GURL(kChromeWebstoreUpdateURL);
 }
 
-GURL GetWebstoreReportAbuseUrl(const std::string& extension_id) {
-  return GURL(GetWebstoreLaunchURL() + "/report/" + extension_id);
+GURL GetWebstoreReportAbuseUrl(const std::string& extension_id,
+                               const std::string& referrer_id) {
+  return GURL(base::StringPrintf("%s/report/%s?utm_source=%s",
+                                 GetWebstoreLaunchURL().c_str(),
+                                 extension_id.c_str(), referrer_id.c_str()));
 }
 
 bool IsWebstoreUpdateUrl(const GURL& update_url) {