Add policies to control power management on the Chrome OS login screen

chrome/browser/policy/configuration_policy_handler.h

 // Copyright (c) 2012 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_POLICY_CONFIGURATION_POLICY_HANDLER_H_
 #define CHROME_BROWSER_POLICY_CONFIGURATION_POLICY_HANDLER_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
@@ skipping 201 matching lines @@
   virtual void ApplyPolicySettings(const PolicyMap& policies,
                                    PrefValueMap* prefs) OVERRIDE;
 
  private:
   // Name of the pref to write.
   const char* pref_path_;
 
   DISALLOW_COPY_AND_ASSIGN(IntPercentageToDoublePolicyHandler);
 };
 
+// A policy handler implementation that ensures an int policy's value is part of
+// an allowed set of values. Rejects values not found in the set.
+class IntSetPolicyHandler : public TypeCheckingPolicyHandler {
+ public:
+  IntSetPolicyHandler(const char* policy_name,
+                      const char* pref_path,
+                      const int* allowed_set_begin,
+                      const int* allowed_set_end);
+  virtual ~IntSetPolicyHandler();
+
+  // ConfigurationPolicyHandler:
+  virtual bool CheckPolicySettings(const PolicyMap& policies,
+                                   PolicyErrorMap* errors) OVERRIDE;
+  virtual void ApplyPolicySettings(const PolicyMap& policies,
+                                   PrefValueMap* prefs) OVERRIDE;
+
+ private:
+  // Checks that the value is part of the allowed set. Returns false if the
+  // value cannot be parsed or is not found in the set.
+  bool EnsureInAllowedSet(const base::Value* value,
+                          PolicyErrorMap* errors);
+
+  // Name of the pref to write.
+  const char* pref_path_;
+
+  // The allowed set of values.
+  const int* allowed_set_begin_;
+  const int* allowed_set_end_;
+
+  DISALLOW_COPY_AND_ASSIGN(IntSetPolicyHandler);
+};
+
 // Implements additional checks for policies that are lists of extension IDs.
 class ExtensionListPolicyHandler : public TypeCheckingPolicyHandler {
  public:
   ExtensionListPolicyHandler(const char* policy_name,
                              const char* pref_path,
                              bool allow_wildcards);
   virtual ~ExtensionListPolicyHandler();
 
   // ConfigurationPolicyHandler methods:
   virtual bool CheckPolicySettings(const PolicyMap& policies,
@@ skipping 303 matching lines @@
  private:
   void ApplyPolicySettingsFromHomePage(const PolicyMap& policies,
                                        PrefValueMap* prefs);
 
   DISALLOW_COPY_AND_ASSIGN(RestoreOnStartupPolicyHandler);
 };
 
 }  // namespace policy
 
 #endif  // CHROME_BROWSER_POLICY_CONFIGURATION_POLICY_HANDLER_H_