[gin] Add a v8::Platform implementation to allow for v8 posting tasks

gin/public/v8_platform.h

+// Copyright 2014 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 GIN_PUBLIC_V8_PLATFORM_H_
+#define GIN_PUBLIC_V8_PLATFORM_H_
+
+#include "base/basictypes.h"

[tfarina, 2014/04/05 03:42:13]

super-tiny-nit: this should have been base/macros.h :)

+#include "base/compiler_specific.h"
+#include "base/lazy_instance.h"
+#include "gin/gin_export.h"
+#include "v8/include/v8-platform.h"
+
+namespace gin {
+
+// A v8::Platform implementation to use with gin.
+class GIN_EXPORT V8Platform : public NON_EXPORTED_BASE(v8::Platform) {
+ public:
+  static V8Platform* Get();
+
+  // v8::Platform implementation.
+  virtual void CallOnBackgroundThread(
+      v8::Task* task,
+      v8::Platform::ExpectedRuntime expected_runtime) OVERRIDE;
+  virtual void CallOnForegroundThread(v8::Isolate* isolate,
+                                      v8::Task* task) OVERRIDE;
+ private:
+  friend struct base::DefaultLazyInstanceTraits<V8Platform>;
+
+  V8Platform();
+  virtual ~V8Platform();
+
+  DISALLOW_COPY_AND_ASSIGN(V8Platform);
+};
+
+}  // namespace gin
+
+#endif  // GIN_PUBLIC_V8_PLATFORM_H_