Add PerAppSettingsService and use it to remember what desktop apps should create windows on.

chrome/browser/apps/per_app_settings_service_factory.h

Index: chrome/browser/apps/per_app_settings_service_factory.h
diff --git a/chrome/browser/apps/per_app_settings_service_factory.h b/chrome/browser/apps/per_app_settings_service_factory.h
new file mode 100644
index 0000000000000000000000000000000000000000..7f5434b2e24360ce8b275dfc8989320e0c398ea2
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+++ b/chrome/browser/apps/per_app_settings_service_factory.h
@@ -0,0 +1,37 @@
+// Copyright 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_APPS_PER_APP_SETTINGS_SERVICE_FACTORY_H_
+#define CHROME_BROWSER_APPS_PER_APP_SETTINGS_SERVICE_FACTORY_H_
+
+#include "components/browser_context_keyed_service/browser_context_keyed_service_factory.h"
+
+namespace content {
+class BrowserContext;
+}
+
+class PerAppSettingsService;
+
+template <typename T> struct DefaultSingletonTraits;
+class PerAppSettingsServiceFactory : public BrowserContextKeyedServiceFactory {
+ public:
+  static PerAppSettingsServiceFactory* GetInstance();
+  static PerAppSettingsService* GetForBrowserContext(
+      content::BrowserContext* browser_context);
+
+ private:
+  friend struct DefaultSingletonTraits<PerAppSettingsServiceFactory>;
+
+  PerAppSettingsServiceFactory();
+  virtual ~PerAppSettingsServiceFactory();
+
+  // BrowserContextKeyedServiceFactory:
+  virtual BrowserContextKeyedService* BuildServiceInstanceFor(
+      content::BrowserContext* context) const OVERRIDE;
+  virtual bool ServiceIsCreatedWithBrowserContext() const OVERRIDE;
+  virtual content::BrowserContext* GetBrowserContextToUse(
+      content::BrowserContext* context) const OVERRIDE;
+};
+
+#endif  // CHROME_BROWSER_APPS_PER_APP_SETTINGS_SERVICE_FACTORY_H_