If user had consented for metrics reporting, send speech input request origin to the server.

chrome/common/net/url_fetcher.cc

Index: chrome/common/net/url_fetcher.cc
diff --git a/chrome/common/net/url_fetcher.cc b/chrome/common/net/url_fetcher.cc
index 53487b712215e56ff585fef3947a97382261e39f..e2aad810d92d020242a6173c2beccee51810151f 100644
--- a/chrome/common/net/url_fetcher.cc
+++ b/chrome/common/net/url_fetcher.cc
@@ -127,6 +127,7 @@ class URLFetcher::Core
 
   std::string upload_content_;       // HTTP POST payload
   std::string upload_content_type_;  // MIME type of POST payload
+  std::string referrer_;             // HTTP Referer header value
 
   // Used to determine how long to wait before making a request or doing a
   // retry.
@@ -336,6 +337,7 @@ void URLFetcher::Core::StartURLRequest() {
   }
   request_->set_load_flags(flags);
   request_->set_context(request_context_getter_->GetURLRequestContext());
+  request_->set_referrer(referrer_);
 
   switch (request_type_) {
     case GET:
@@ -481,6 +483,10 @@ const std::string& URLFetcher::upload_data() const {
   return core_->upload_content_;
 }
 
+void URLFetcher::set_referrer(const std::string& referrer) {
+  core_->referrer_ = referrer;
+}
+
 void URLFetcher::set_load_flags(int load_flags) {
   core_->load_flags_ = load_flags;
 }