athena: Add the concept of Activity and related managers.

athena/ui/sample_task.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.
+
+#include "athena/task/public/task.h"
+#include "base/memory/scoped_ptr.h"
+
+class SampleTask : public athena::Task {
+ public:
+  SampleTask(SkColor color,
+             SkColor content,
+             const std::string& title);
+  virtual ~SampleTask();
+
+ private:
+  // athena::Task:
+  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(SampleTask);
+};