[cros] Add --stub-cros-settings option for testing.

chrome/browser/chromeos/stub_cros_settings_provider.h

+// Copyright (c) 2011 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_CHROMEOS_STUB_CROS_SETTINGS_PROVIDER_H_
+#define CHROME_BROWSER_CHROMEOS_STUB_CROS_SETTINGS_PROVIDER_H_
+
+#include <string>
+
+#include "chrome/browser/chromeos/cros_settings_provider.h"
+#include "chrome/browser/prefs/pref_value_map.h"
+
+namespace chromeos {
+
+// CrosSettingsProvider implementation that stores settings in memory unsigned.
+class StubCrosSettingsProvider : public CrosSettingsProvider {
+ public:
+  StubCrosSettingsProvider();
+  virtual ~StubCrosSettingsProvider();
+
+  // CrosSettingsProvider implementation.
+  virtual const base::Value* Get(const std::string& path) const OVERRIDE;
+  virtual bool GetTrusted(const std::string& path,
+                          const base::Closure& callback) OVERRIDE;
+  virtual bool HandlesSetting(const std::string& path) const OVERRIDE;
+  virtual void Reload() OVERRIDE;
+
+ private:
+  // CrosSettingsProvider implementation:
+  virtual void DoSet(const std::string& path,
+                     const base::Value& value) OVERRIDE;
+
+  // Initializes settings to their defaults.
+  void SetDefaults();
+
+  // In-memory settings storage.
+  PrefValueMap values_;
+
+  DISALLOW_COPY_AND_ASSIGN(StubCrosSettingsProvider);
+};
+
+}  // namespace chromeos
+
+#endif  // CHROME_BROWSER_CHROMEOS_STUB_CROS_SETTINGS_PROVIDER_H_