Turn libplatform into a component

src/libplatform/default-platform.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/libplatform/default-platform.h"
 
 #include <algorithm>
 #include <queue>
 
+#include "include/libplatform/libplatform.h"
 #include "src/base/logging.h"
 #include "src/base/platform/platform.h"
 #include "src/base/platform/time.h"
 #include "src/base/sys-info.h"
 #include "src/libplatform/worker-thread.h"
 
 namespace v8 {
 namespace platform {
 
 
@@ skipping 211 matching lines @@
   tracing_controller_->AddTraceStateObserver(observer);
 }
 
 void DefaultPlatform::RemoveTraceStateObserver(TraceStateObserver* observer) {
   if (!tracing_controller_) return;
   tracing_controller_->RemoveTraceStateObserver(observer);
 }
 
 }  // namespace platform
 }  // namespace v8