Implement <webview>.addContentScript/removeContentScript API [1]

extensions/renderer/resources/guest_view/web_view_experimental.js

Index: extensions/renderer/resources/guest_view/web_view_experimental.js
diff --git a/extensions/renderer/resources/guest_view/web_view_experimental.js b/extensions/renderer/resources/guest_view/web_view_experimental.js
index 04299e93cbe22f99c6fa51d905da2b4b02cd85b5..334a0a00ee18cb3dc1b9dc6a3fad8636a6e3fc61 100644
--- a/extensions/renderer/resources/guest_view/web_view_experimental.js
+++ b/extensions/renderer/resources/guest_view/web_view_experimental.js
@@ -11,9 +11,29 @@
 var WebViewImpl = require('webView').WebViewImpl;
 var WebViewInternal = require('webViewInternal').WebViewInternal;
 
+WebViewImpl.prototype.addContentScripts = function() {
+  if (!this.guest.getId()) {
+    window.console.error(WebViewConstants.ERROR_MSG_CANNOT_INJECT_SCRIPT);
+    return false;
+  }
+  var args = $Array.concat([this.guest.getId()], $Array.slice(arguments));
+  return $Function.apply(WebViewInternal.addContentScripts, null, args);
+};
+
+WebViewImpl.prototype.removeContentScripts = function(var_args) {
+  if (!this.guest.getId()) {
+    window.console.error(WebViewConstants.ERROR_MSG_CANNOT_INJECT_SCRIPT);
+    return false;
+  }
+  var args = $Array.concat([this.guest.getId()], $Array.slice(arguments));
+  return $Function.apply(WebViewInternal.removeContentScripts, null, args);
+};
+
 // An array of <webview>'s experimental API methods. See |WEB_VIEW_API_METHODS|
 // in web_view_api_methods.js for more details.
 var WEB_VIEW_EXPERIMENTAL_API_METHODS = [
+  'addContentScripts',
+  'removeContentScripts'
 ];
 
 // Registers the experimantal WebVIew API when available.