Change NotifyAppList*() functions into observers on a ProfileKeyedService.

chrome/browser/extensions/install_tracker.h

Index: chrome/browser/extensions/install_tracker.h
diff --git a/chrome/browser/extensions/install_tracker.h b/chrome/browser/extensions/install_tracker.h
new file mode 100644
index 0000000000000000000000000000000000000000..09770e7307dfb8c78aae2f631cb55cc6a08ca28d
--- /dev/null
+++ b/chrome/browser/extensions/install_tracker.h
@@ -0,0 +1,59 @@
+// 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_EXTENSIONS_INSTALL_TRACKER_H_
+#define CHROME_BROWSER_EXTENSIONS_INSTALL_TRACKER_H_
+
+#include "base/observer_list.h"
+#include "chrome/browser/profiles/profile_keyed_service.h"
+#include "ui/gfx/image/image_skia.h"
+
+class Profile;
+
+namespace extensions {
+
+class InstallObserver {
+ public:
+  virtual void OnBeginExtensionInstall(
+      const std::string& extension_id,
+      const std::string& extension_name,
+      const gfx::ImageSkia& installing_icon,
+      bool is_app) = 0;
+
+  virtual void OnDownloadProgress(const std::string& extension_id,
+                                  int percent_downloaded) = 0;
+
+  virtual void OnInstallFailure(

[benwells, 2013/02/21 06:15:38]

nit: will fit on one line (i think)

[koz (OOO until 15th September), 2013/02/25 02:39:28]

Done.

+      const std::string& extension_id) = 0;

[xiyuan, 2013/02/21 06:33:17]

nit: add a protected virtual destructor.

[koz (OOO until 15th September), 2013/02/25 02:39:28]

Done.

+};
+
+class InstallTracker : public ProfileKeyedService, public InstallObserver {

[xiyuan, 2013/02/21 06:33:17]

InstallTracker probably should not derive from InstallObserver because it does
not serve such purpose. It could provide methods to fire the notifications for
InstallObserver but I don't think it should be derived from it.

[koz (OOO until 15th September), 2013/02/25 02:39:28]

Done.

+ public:
+  explicit InstallTracker(Profile* profile);
+  virtual ~InstallTracker();
+
+  // ProfileKeyedService implementation.
+  virtual void Shutdown() OVERRIDE {}

[xiyuan, 2013/02/21 06:33:17]

Think we can get rid of this since we are not really overriding anything here.

[koz (OOO until 15th September), 2013/02/25 02:39:28]

Done.

+
+  void AddObserver(InstallObserver* observer);
+  void RemoveObserver(InstallObserver* observer);
+
+  // InstallObserver overrides.
+  virtual void OnBeginExtensionInstall(
+      const std::string& extension_id,
+      const std::string& extension_name,
+      const gfx::ImageSkia& installing_icon,
+      bool is_app) OVERRIDE;
+  virtual void OnDownloadProgress(const std::string& extension_id,
+                                  int percent_downloaded) OVERRIDE;
+  virtual void OnInstallFailure(const std::string& extension_id) OVERRIDE;
+
+ private:
+  Profile* profile_;

[xiyuan, 2013/02/21 06:33:17]

This does not seem used anywhere. Think we could get rid of it.

[koz (OOO until 15th September), 2013/02/25 02:39:28]

Done.

+  ObserverList<InstallObserver> observers_;

[xiyuan, 2013/02/21 06:33:17]

DISALLOW_COPY_AND_ASSIGN(...)

[koz (OOO until 15th September), 2013/02/25 02:39:28]

Done.

+};
+
+}  // namespace extensions
+
+#endif  // CHROME_BROWSER_EXTENSIONS_INSTALL_TRACKER_H_