athena: Add the concept of Activity and related managers.

athena/main/web_activity.h

Index: athena/main/web_activity.h
diff --git a/athena/main/web_activity.h b/athena/main/web_activity.h
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+++ b/athena/main/web_activity.h
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+// 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_WEB_ACTIVITY_H_
+#define ATHENA_MAIN_WEB_ACTIVITY_H_
+
+#include "athena/activity/public/activity.h"
+#include "athena/activity/public/activity_view_model.h"
+#include "content/public/browser/web_contents_observer.h"
+
+namespace content {
+class WebContents;
+}
+
+class WebActivity : public athena::Activity,
+                    public athena::ActivityViewModel,
+                    public content::WebContentsObserver {
+ public:
+  explicit WebActivity(content::WebContents* contents);
+  virtual ~WebActivity();
+
+ protected:
+  // athena::Activity:
+  virtual athena::ActivityViewModel* GetActivityViewModel() OVERRIDE;
+
+  // athena::ActivityViewModel:
+  virtual SkColor GetRepresentativeColor() OVERRIDE;
+  virtual std::string GetTitle() OVERRIDE;
+  virtual aura::Window* GetNativeWindow() OVERRIDE;
+
+  // content::WebContentsObserver:
+  virtual void TitleWasSet(content::NavigationEntry* entry,
+                           bool explicit_set) OVERRIDE;
+  virtual void DidUpdateFaviconURL(
+      const std::vector<content::FaviconURL>& candidates) OVERRIDE;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(WebActivity);
+};
+
+#endif  // ATHENA_MAIN_WEB_ACTIVITY_H_