Allow omitting optional parameters for Extensions API functions

chrome/renderer/resources/extensions/json_schema.js

Index: chrome/renderer/resources/extensions/json_schema.js
diff --git a/chrome/renderer/resources/extensions/json_schema.js b/chrome/renderer/resources/extensions/json_schema.js
index ad47748ae0c5bd90f3becc5baefb23e8e9946df5..717ef50c3f4abce064c590bcb08cec515b0b32c1 100644
--- a/chrome/renderer/resources/extensions/json_schema.js
+++ b/chrome/renderer/resources/extensions/json_schema.js
@@ -144,6 +144,52 @@ chromeHidden.JSONSchemaValidator.prototype.addTypes = function(typeOrTypeList) {
 }
 
 /**
+ * Returns a list of strings of the types that this schema accepts.
+ */
+chromeHidden.JSONSchemaValidator.prototype.getAllTypesForSchema = function(
+    schema) {
+  var schemaTypes = [];
+  if (schema.type)
+    schemaTypes.push(schema.type);
+  if (schema.choices) {
+    for (var i = 0; i < schema.choices.length; i++)
+      schemaTypes.push(schema.choices[i].type);
+  }
+  if (schema['$ref']) {
+    var refTypes = this.getAllTypesForSchema(this.types[schema['$ref']]);
+    schemaTypes = schemaTypes.concat(refTypes);
+  }
+  return schemaTypes;
+};
+
+/**
+ * Returns true if |schema| would accept an argument of type |type|.
+ */
+chromeHidden.JSONSchemaValidator.prototype.isValidSchemaType = function(
+    type, schema) {
+  schemaTypes = this.getAllTypesForSchema(schema);
+  for (var i = 0; i < schemaTypes.length; i++) {
+    if (schemaTypes[i] == "any" || type == schemaTypes[i])
+      return true;
+  }
+  return type == "any";
+};
+
+/**
+ * Returns true if there is a non-null argument that both |schema1| and
+ * |schema2| would accept.
+ */
+chromeHidden.JSONSchemaValidator.prototype.checkSchemaOverlap = function(
+    schema1, schema2) {
+  var schema1Types = this.getAllTypesForSchema(schema1);
+  for (var i = 0; i < schema1Types.length; i++) {
+    if (this.isValidSchemaType(schema1Types[i], schema2))
+      return true;
+  }
+  return false;
+};
+
+/**
  * Validates an instance against a schema. The instance can be any JavaScript
  * value and will be validated recursively. When this method returns, the
  * |errors| property will contain a list of errors, if any.
@@ -448,4 +494,11 @@ chromeHidden.JSONSchemaValidator.prototype.addError = function(
   });
 };
 
+/**
+ * Resets errors to an empty list so you can call 'validate' again.
+ */
+chromeHidden.JSONSchemaValidator.prototype.resetErrors = function() {
+  this.errors = [];
+};
+
 })();