Add a simple one shot and repeating timer API for Mojo.js.

gin/modules/timer.h

Index: gin/modules/timer.h
diff --git a/gin/modules/timer.h b/gin/modules/timer.h
new file mode 100644
index 0000000000000000000000000000000000000000..c39e1310c69fcffa7764cb6468f198819db30711
--- /dev/null
+++ b/gin/modules/timer.h
@@ -0,0 +1,63 @@
+// Copyright 2013 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_MODULES_TIMER_H_
+#define GIN_MODULES_TIMER_H_
+
+#include "base/memory/weak_ptr.h"
+#include "base/timer/timer.h"
+#include "gin/gin_export.h"
+#include "gin/handle.h"
+#include "gin/runner.h"
+#include "gin/wrappable.h"
+#include "v8/include/v8.h"
+
+namespace gin {
+
+class ObjectTemplateBuilder;
+
+// A simple scriptable timer that can work in one-shot or repeating mode.
+class GIN_EXPORT Timer : public Wrappable<Timer> {
+ public:
+  enum TimerType {
+    TYPE_ONE_SHOT,
+    TYPE_REPEATING
+  };
+
+  static WrapperInfo kWrapperInfo;
+  static Handle<Timer> Create(TimerType type, v8::Isolate* isolate,
+                              int delay_ms, v8::Handle<v8::Function> function);
+
+  virtual ObjectTemplateBuilder GetObjectTemplateBuilder(
+      v8::Isolate* isolate) OVERRIDE;
+
+ private:
+  Timer(v8::Isolate* isolate, bool repeating, int delay_ms,
+        v8::Handle<v8::Function> function);
+  virtual ~Timer();
+  void OnTimerFired();
+
+  base::WeakPtrFactory<Timer> weak_factory_;
+  base::Timer timer_;
+  base::WeakPtr<gin::Runner> runner_;
+};
+
+
+class GIN_EXPORT TimerModule : public Wrappable<TimerModule> {
+ public:
+  static WrapperInfo kWrapperInfo;
+  static Handle<TimerModule> Create(v8::Isolate* isolate);
+  static v8::Local<v8::Value> GetModule(v8::Isolate* isolate);
+
+ private:
+  TimerModule();
+  virtual ~TimerModule();
+
+  virtual ObjectTemplateBuilder GetObjectTemplateBuilder(
+      v8::Isolate* isolate) OVERRIDE;
+};
+
+}  // namespace gin
+
+#endif  // GIN_MODULES_TIMER_H_