[Origin Trials] Install origin trial bindings on V8 context conditionally

third_party/WebKit/Source/core/testing/v8/WebCoreTestSupport.h

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 17 matching lines @@
 
 // Normally we'd have:
 // #include <v8.h>
 // ...but this file is used in cases where we don't have V8 (e.g., Skia)
 namespace v8 {
 class Context;
 class Value;
 template <class T> class Local;
 }
 
+namespace blink {
+class ScriptState;
+}
+
 namespace WebCoreTestSupport {
 
 v8::Local<v8::Value> createInternalsObject(v8::Local<v8::Context>);
 void injectInternalsObject(v8::Local<v8::Context>);
 void resetInternalsObject(v8::Local<v8::Context>);
+void installOriginTrialsForTests(blink::ScriptState*);
 
 } // namespace blink
 
 #endif