Add additional restriction to policy schema internal (part1)

components/policy/core/common/schema_internal.h

Index: components/policy/core/common/schema_internal.h
diff --git a/components/policy/core/common/schema_internal.h b/components/policy/core/common/schema_internal.h
index 40d557a408d72ff868b0bfd3bf58ce537e75f9e9..3a543f4ff3627580dfb71d68a89a42788c25ba7b 100644
--- a/components/policy/core/common/schema_internal.h
+++ b/components/policy/core/common/schema_internal.h
@@ -28,6 +28,11 @@ struct POLICY_EXPORT SchemaNode {
   // SchemaData::schema_nodes that indexes the SchemaNode describing the items
   // of this list.
   //
+  // If |type| is TYPE_INTEGER or TYPE_STRING, and contains corresponding
+  // limitations (enumeration of possible values, or range for integer), then
+  // |extra| is an offset into SchemaData::limitation_nodes that indexes the
+  // LimitationNode describing the limitation on the value.
+  //
   // Otherwise extra is -1 and is invalid.
   int extra;
 };
@@ -66,12 +71,42 @@ struct POLICY_EXPORT PropertiesNode {
   int additional;
 };
 
+// Represent the limitation on TYPE_INTEGER or TYPE_STRING instance of

[Joao da Silva, 2014/01/14 10:50:41]

*Represents

[binjin, 2014/01/15 15:02:54]

Done.

+// base::Value.
+struct POLICY_EXPORT LimitationNode {
+  // Set to true if RangedLimitation is used, and set to false otherwise.
+  bool is_ranged;
+
+  union LimitationValues {
+    // Offsets into SchemaData::int_enums or SchemaData::string_enums, the
+    // entry of which describes the enumeration of all possible values of
+    // corresponding integer or string value.
+    struct EnumerationLimitation {
+      int offset_begin;
+      int offset_end;
+    };
+    // For integer type only, represents that all values between |min_value|

[Joao da Silva, 2014/01/14 10:50:41]

nit: add a newline after };

[binjin, 2014/01/15 15:02:54]

Done.

+    // and |max_value| can be choosed. Note that integer type in base::Value

[Joao da Silva, 2014/01/14 10:50:41]

*chosen

[binjin, 2014/01/15 15:02:54]

Done.

+    // is bounded, so this can also be used if only one of |min_value| and
+    // |max_value| is stated.
+    struct RangedLimitation {
+      int min_value;
+      int max_value;
+    };
+  };
+};
+
+
 // Contains arrays of related nodes. All of the offsets in these nodes reference
 // other nodes in these arrays.
 struct POLICY_EXPORT SchemaData {
   const SchemaNode* schema_nodes;
   const PropertyNode* property_nodes;
   const PropertiesNode* properties_nodes;
+  const LimitationNode* limitation_nodes;
+
+  const int* int_enums;
+  const char** string_enums;
 };
 
 }  // namespace internal