Update json_schema_compiler to handle the Automation extension API

tools/json_schema_compiler/js_externs_generator_test.py

Index: tools/json_schema_compiler/js_externs_generator_test.py
diff --git a/tools/json_schema_compiler/js_externs_generator_test.py b/tools/json_schema_compiler/js_externs_generator_test.py
index 917ce6379fb6db95b2973748096b55367282f66f..88c2a09f04d0773e10fa5643d730557c2cf42975 100755
--- a/tools/json_schema_compiler/js_externs_generator_test.py
+++ b/tools/json_schema_compiler/js_externs_generator_test.py
@@ -47,6 +47,18 @@ namespace fakeApi {
     ArrayBuffer arrayBuff;
   };
 
+  dictionary Qux {
+    long notOptionalLong;
+    long? optionalLong;
+
+    // A map from string to number.
+    // <jsexterns>@type {Object<string, number>}</jsexterns>
+    object dict;
+
+    static void go();
+    static void stop();
+  };
+
   callback VoidCallback = void();
 
   callback BazGreekCallback = void(Baz baz, Greek greek);
@@ -132,6 +144,43 @@ chrome.fakeApi.Bar;
 chrome.fakeApi.Baz;
 
 /**
+ * @constructor
+ * @private
+ * @see https://developer.chrome.com/extensions/fakeApi#type-Qux
+ */
+chrome.fakeApi.Qux = function() {};
+
+/**
+ * @type {number}
+ * @see https://developer.chrome.com/extensions/fakeApi#type-notOptionalLong
+ */
+chrome.fakeApi.Qux.prototype.notOptionalLong;
+
+/**
+ * @type {(number|undefined)}
+ * @see https://developer.chrome.com/extensions/fakeApi#type-optionalLong
+ */
+chrome.fakeApi.Qux.prototype.optionalLong;
+
+/**
+ * A map from string to number.
+ * @type {Object<string, number>}
+ * @see https://developer.chrome.com/extensions/fakeApi#type-dict
+ */
+chrome.fakeApi.Qux.prototype.dict;
+
+/**
+ * @see https://developer.chrome.com/extensions/fakeApi#method-go
+ */
+chrome.fakeApi.Qux.prototype.go = function() {};
+
+/**
+ * @see https://developer.chrome.com/extensions/fakeApi#method-stop
+ */
+chrome.fakeApi.Qux.prototype.stop = function() {};
+
+
+/**
  * Does something exciting! And what's more, this is a multiline function
  * comment! It goes onto multiple lines!
  * @param {!chrome.fakeApi.Baz} baz The baz to use.