Add blink::WebSocketHandshakeThrottle

third_party/WebKit/Source/platform/exported/Platform.cpp

Index: third_party/WebKit/Source/platform/exported/Platform.cpp
diff --git a/third_party/WebKit/Source/platform/exported/Platform.cpp b/third_party/WebKit/Source/platform/exported/Platform.cpp
index d8a57f767b43c1e34e0c7fcee0544f4686da19f4..c28506a52b954bd9013e688f80437df3040d3921 100644
--- a/third_party/WebKit/Source/platform/exported/Platform.cpp
+++ b/third_party/WebKit/Source/platform/exported/Platform.cpp
@@ -53,6 +53,7 @@
 #include "public/platform/WebPrerenderingSupport.h"
 #include "public/platform/WebRTCCertificateGenerator.h"
 #include "public/platform/WebRTCPeerConnectionHandler.h"
+#include "public/platform/WebSocketHandshakeThrottle.h"
 #include "public/platform/WebStorageNamespace.h"
 #include "public/platform/WebThread.h"
 #include "public/platform/modules/serviceworker/WebServiceWorkerCacheStorage.h"
@@ -227,6 +228,11 @@ std::unique_ptr<WebCanvasCaptureHandler> Platform::CreateCanvasCaptureHandler(
   return nullptr;
 }
 
+std::unique_ptr<WebSocketHandshakeThrottle>
+Platform::CreateWebSocketHandshakeThrottle() {
+  return nullptr;
+}
+
 std::unique_ptr<WebImageCaptureFrameGrabber>
 Platform::CreateImageCaptureFrameGrabber() {
   return nullptr;