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

chrome/renderer/resources/extensions/chrome_web_view_experimental.js

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This module implements experimental API for <webview>.
 // See web_view.js for details.
 //
 // <webview> Chrome Experimental API is only available on canary and dev
 // channels of Chrome.
 
 var ChromeWebView = require('chromeWebViewInternal').ChromeWebView;
 var ChromeWebViewSchema =
     requireNative('schema_registry').GetSchema('chromeWebViewInternal');
 var ContextMenusSchema =
     requireNative('schema_registry').GetSchema('contextMenus');
 var CreateEvent = require('webViewEvents').CreateEvent;
 var EventBindings = require('event_bindings');
 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();
 }
 
 // This is the only "webViewInternal.onClicked" named event for this renderer.
 //
 // Since we need an event per <webview>, we define events with suffix
 // (subEventName) in each of the <webview>. Behind the scenes, this event is
 // registered as a ContextMenusEvent, with filter set to the webview's
@@ skipping 136 matching lines @@
 
   // Expose <webview>.contextMenus object.
   Object.defineProperty(
       this.element,
       'contextMenus',
       {
         get: createContextMenus(),
         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;
+};