Implement declarative content script API for <webview> [js part].

chrome/renderer/resources/extensions/chrome_web_view_experimental.js

Index: chrome/renderer/resources/extensions/chrome_web_view_experimental.js
diff --git a/chrome/renderer/resources/extensions/chrome_web_view_experimental.js b/chrome/renderer/resources/extensions/chrome_web_view_experimental.js
index f3db4bb6949b98550b80df981ce51c94acacbf7e..442f84b5922a850865180da408b1d60fcfd3de27 100644
--- a/chrome/renderer/resources/extensions/chrome_web_view_experimental.js
+++ b/chrome/renderer/resources/extensions/chrome_web_view_experimental.js
@@ -19,6 +19,23 @@ var idGeneratorNatives = requireNative('id_generator');
 var MessagingNatives = requireNative('messaging_natives');
 var utils = require('utils');
 var WebViewImpl = require('webView').WebViewImpl;
+var DeclarativeContentSchema =
+    requireNative('schema_registry').GetSchema('declarativeContent');
+
+var DeclarativeContentEvent = function(opt_eventName,
+                                       opt_argSchemas,
+                                       opt_eventOptions,
+                                       opt_webViewInstanceId) {
+  EventBindings.Event.call(this,
+                           opt_eventName,
+                           opt_argSchemas,
+                           opt_eventOptions,
+                           opt_webViewInstanceId);
+}
+
+DeclarativeContentEvent.prototype = {
+  __proto__: EventBindings.Event.prototype
+};
 
 function GetUniqueSubEventName(eventName) {
   return eventName + '/' + idGeneratorNatives.GetNextId();
@@ -175,3 +192,35 @@ WebViewImpl.prototype.setupExperimentalContextMenus = function() {
         enumerable: true
       });
 };
+
+WebViewImpl.prototype.maybeSetupExperimentalChromeWebViewEvents = function(
+    request) {
+  var createDeclarativeContentEvent = function(declarativeContentEvent) {
+    return function() {
+      if (!this[declarativeContentEvent.name]) {
+        this[declarativeContentEvent.name] =
+            new DeclarativeContentEvent(
+                'webViewInternal.declarativeContent.' +
+                declarativeContentEvent.name,
+                declarativeContentEvent.parameters,
+                declarativeContentEvent.options,
+                this.viewInstanceId);
+      }
+      return this[declarativeContentEvent.name];
+    }.bind(this);
+  }.bind(this);
+
+  for (var i = 0; i < DeclarativeContentSchema.events.length; ++i) {
+    var eventSchema = DeclarativeContentSchema.events[i];
+    var declarativeContentEvent = createDeclarativeContentEvent(eventSchema);
+    Object.defineProperty(
+        request,
+        eventSchema.name,
+        {
+          get: declarativeContentEvent,
+          enumerable: true
+        }
+    );
+  }
+  return request;
+};