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

chrome/browser/policy/configuration_policy_handler.h

Index: chrome/browser/policy/configuration_policy_handler.h
diff --git a/chrome/browser/policy/configuration_policy_handler.h b/chrome/browser/policy/configuration_policy_handler.h
index 449a11a10085f25af1fc7d895f2e58e957bab9b1..f9a1361bac43a3c167d1ad269a9a8d0508411a5a 100644
--- a/chrome/browser/policy/configuration_policy_handler.h
+++ b/chrome/browser/policy/configuration_policy_handler.h
@@ -219,6 +219,38 @@ class IntPercentageToDoublePolicyHandler : public IntRangePolicyHandlerBase {
   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: