athena: Add the concept of Activity and related managers.

athena/main/sample_activity.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 ATHENA_MAIN_SAMPLE_ACTIVITY_H_
+#define ATHENA_MAIN_SAMPLE_ACTIVITY_H_
+
+#include "athena/activity/public/activity.h"
+#include "athena/activity/public/activity_view_model.h"
+#include "base/memory/scoped_ptr.h"
+
+class SampleActivity : public athena::Activity,
+                       public athena::ActivityViewModel {
+ public:
+  SampleActivity(SkColor color, SkColor content, const std::string& title);
+  virtual ~SampleActivity();
+
+ private:
+  // athena::Activity:
+  virtual athena::ActivityViewModel* GetActivityViewModel() OVERRIDE;
+
+  // athena::ActivityViewModel:
+  virtual SkColor GetRepresentativeColor() OVERRIDE;
+  virtual std::string GetTitle() OVERRIDE;
+  virtual aura::Window* GetNativeWindow() OVERRIDE;
+
+  SkColor color_;
+  SkColor content_color_;
+  std::string title_;
+  scoped_ptr<aura::Window> window_;
+
+  DISALLOW_COPY_AND_ASSIGN(SampleActivity);
+};
+
+#endif  // ATHENA_MAIN_SAMPLE_ACTIVITY_H_