Added Client-Hints.

chrome/common/chrome_switches.cc

Index: chrome/common/chrome_switches.cc
diff --git a/chrome/common/chrome_switches.cc b/chrome/common/chrome_switches.cc
index 402be6321938afe410d03ebdca75f935146caa1a..a421f236656a82f021eda7a4348dea4aa6bee71d 100644
--- a/chrome/common/chrome_switches.cc
+++ b/chrome/common/chrome_switches.cc
@@ -461,6 +461,9 @@ const char kEnableAutologin[]               = "enable-autologin";
 // Enables the benchmarking extensions.
 const char kEnableBenchmarking[]            = "enable-benchmarking";
 
+// Enables client hints, which adds hints about browser state to HTTP requests.
+const char kEnableClientHints[]             = "enable-client-hints";
+
 // This applies only when the process type is "service". Enables the Cloud
 // Print Proxy component within the service process.
 const char kEnableCloudPrintProxy[]         = "enable-cloud-print-proxy";