Added Client-Hints.

chrome/browser/net/chrome_network_delegate.h

Index: chrome/browser/net/chrome_network_delegate.h
diff --git a/chrome/browser/net/chrome_network_delegate.h b/chrome/browser/net/chrome_network_delegate.h
index 85bfd0fbb063343a161559080a71922189d148c7..edcc9d8420e2c42fc8025b1018ee4ba863ec67c3 100644
--- a/chrome/browser/net/chrome_network_delegate.h
+++ b/chrome/browser/net/chrome_network_delegate.h
@@ -11,6 +11,7 @@
 #include "base/compiler_specific.h"
 #include "base/memory/ref_counted.h"
 #include "base/values.h"
+#include "chrome/browser/net/client_hints.h"
 #include "net/base/network_delegate.h"
 
 class CookieSettings;
@@ -90,6 +91,9 @@ class ChromeNetworkDelegate : public net::NetworkDelegate {
     force_google_safe_search_ = force_google_safe_search;
   }
 
+  // Adds the Client Hints header to HTTP requests.
+  void set_enable_client_hints();
+
   // Causes |OnCanThrottleRequest| to always return false, for all
   // instances of this object.
   static void NeverThrottleRequests();
@@ -203,6 +207,8 @@ class ChromeNetworkDelegate : public net::NetworkDelegate {
   // Total original size of all content before it was transferred.
   int64 original_content_length_;
 
+  scoped_ptr<ClientHints> client_hints_;
+
   DISALLOW_COPY_AND_ASSIGN(ChromeNetworkDelegate);
 };