Make RenderThreadImpl a client of memory coordinator

third_party/WebKit/public/platform/WebMemoryState.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef URLConversion_h
-#define URLConversion_h
-
-#include "WebCommon.h"
-
-class GURL;
+#ifndef WebMemoryState_h
+#define WebMemoryState_h
 
 namespace blink {
 
-class WebString;
-
-BLINK_COMMON_EXPORT GURL WebStringToGURL(const WebString&);
+// These numbers must correspond to base::MemoryState.
+enum class MemoryState {
+  UNKNOWN = -1,
+  NORMAL = 0,
+  THROTTLED = 1,
+  SUSPENDED = 2,
+};
 
 }  // namespace blink
 
 #endif