Add TabWebContentsTracker

chrome/browser/ui/tab_webcontents_tracker.h

Index: chrome/browser/ui/tab_webcontents_tracker.h
diff --git a/chrome/browser/ui/tab_webcontents_tracker.h b/chrome/browser/ui/tab_webcontents_tracker.h
new file mode 100644
index 0000000000000000000000000000000000000000..5050c5af954d67f67e6c06e76550a6f5e73d2f60
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+++ b/chrome/browser/ui/tab_webcontents_tracker.h
@@ -0,0 +1,88 @@
+// Copyright (c) 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 CHROME_BROWSER_UI_TAB_WEBCONTENTS_TRACKER_H_
+#define CHROME_BROWSER_UI_TAB_WEBCONTENTS_TRACKER_H_
+
+#include "base/memory/singleton.h"
+#include "base/observer_list.h"
+#include "chrome/browser/ui/browser_list_observer.h"
+#include "chrome/browser/ui/tabs/tab_strip_model_observer.h"
+
+class Browser;
+class TabStripModel;
+
+namespace content { class WebContents; }

[Bernhard Bauer, 2013/04/26 16:30:10]

Forward declarations go on a separate line.

+
+// TabWebContentsTracker can be used to be notified of events
+// like WebContents in a tab being replaced.
+class TabWebContentsTracker : public chrome::BrowserListObserver,
+                              public TabStripModelObserver {
+ public:
+  static void Init();

[Bernhard Bauer, 2013/04/26 16:30:10]

This method isn't implemented.

+
+  // TabStripModelObserver:

[Adrian Kuegel, 2013/04/26 15:52:27]

Should I add all methods from TabStripModelObserver?

[Bernhard Bauer, 2013/04/26 16:30:10]

Hm. Is there even a reason we need a separate interface for this? Why don't we
just use TabStripModelObserver as the interface?

[Adrian Kuegel, 2013/04/29 08:11:15]

I didn't think about it, but you are right, that should be better.

+  virtual void ActiveTabChanged(content::WebContents* old_contents,
+                                content::WebContents* new_contents,
+                                int index,
+                                int reason) OVERRIDE;
+  virtual void TabInsertedAt(content::WebContents* contents,
+                             int index,
+                             bool foreground) OVERRIDE;
+  virtual void TabClosingAt(TabStripModel* tab_strip_model,
+                            content::WebContents* contents,
+                            int index) OVERRIDE;
+  virtual void TabDetachedAt(content::WebContents* contents, int index)
+      OVERRIDE;
+  virtual void TabReplacedAt(TabStripModel* tab_strip_model,
+                             content::WebContents* old_contents,
+                             content::WebContents* new_contents,
+                             int index) OVERRIDE;
+
+  // BrowserListObserver:
+  virtual void OnBrowserAdded(Browser* browser) OVERRIDE;
+  virtual void OnBrowserRemoved(Browser* browser) OVERRIDE;
+
+  class Observer {

[Bernhard Bauer, 2013/04/26 16:30:10]

Inner class declarations go to the beginning of the (outer) class.

+   public:
+    Observer() {}
+    virtual ~Observer() {}
+    virtual void OnActiveTabChanged(content::WebContents* old_contents,
+                                    content::WebContents* new_contents,
+                                    int index,
+                                    int reason) {}
+    virtual void OnTabInsertedAt(content::WebContents* contents,
+                                 int index,
+                                 bool foreground) {}
+    virtual void OnTabClosingAt(TabStripModel* tab_strip_model,
+                                content::WebContents* contents,
+                                int index) {}
+    virtual void OnTabDetachedAt(content::WebContents* contents, int index) {}
+    virtual void OnTabReplacedAt(TabStripModel* tab_strip_model,
+                                 content::WebContents* old_contents,
+                                 content::WebContents* new_contents,
+                                 int index) {}
+
+   private:
+    DISALLOW_COPY_AND_ASSIGN(Observer);
+  };
+
+  static void AddObserver(Observer* observer);
+  static void RemoveObserver(Observer* observer);
+
+ private:
+  friend class Singleton<TabWebContentsTracker,
+                         DefaultSingletonTraits<TabWebContentsTracker> >;
+  friend struct DefaultSingletonTraits<TabWebContentsTracker>;
+
+  static TabWebContentsTracker* GetInstance();
+
+  TabWebContentsTracker();
+  virtual ~TabWebContentsTracker();
+  ObserverList<Observer> observer_list_;

[Bernhard Bauer, 2013/04/26 16:30:10]

Add a newline between method and member declarations?

+
+  DISALLOW_COPY_AND_ASSIGN(TabWebContentsTracker);
+};
+
+#endif  // CHROME_BROWSER_UI_TAB_WEBCONTENTS_TRACKER_H_