<webview>: Implement dialog API

chrome/test/data/extensions/platform_apps/web_view/dialog/inject_dialog.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.
+
+var embedder = null;
+
+function reportConnected() {
+  if (!embedder) {

[lazyboy, 2013/07/23 18:45:01]

Just curious, is this for correctness or do these functions get called before
channel is established (embedder == null).

[Fady Samuel, 2013/07/23 19:40:52]

It's 'correctness'. Since these are unnecessary I've removed them.

+    return;
+  }
+
+  var msg = ['connected'];
+  embedder.postMessage(JSON.stringify(msg), '*');
+}
+
+function reportAlertCompletion(messageText) {
+  if (!embedder) {
+    return;
+  }
+
+  window.alert(messageText);
+  var msg = ['alert-dialog-requested'];

[lazyboy, 2013/07/23 18:45:01]

This line getting executed means dialog has been dismissed? So s/requested/done
or dismissed.

[Fady Samuel, 2013/07/23 19:40:52]

Done.

+  embedder.postMessage(JSON.stringify(msg), '*');
+}
+
+function reportConfirmDialogResult(messageText) {
+  if (!embedder) {
+    return;
+  }
+
+  var result = window.confirm(messageText);
+  var msg = ['confirm-dialog-result', result];
+  embedder.postMessage(JSON.stringify(msg), '*');
+}
+
+function reportPromptDialogResult(messageText, defaultPromptText) {
+  if (!embedder) {
+    return;
+  }
+
+  var result = window.prompt(messageText, defaultPromptText);
+  var msg = ['prompt-dialog-result', result];
+  embedder.postMessage(JSON.stringify(msg), '*');
+}
+
+window.addEventListener('message', function(e) {
+  embedder = e.source;
+  var data = JSON.parse(e.data);
+  if (data[0] == 'connect') {

[lazyboy, 2013/07/23 18:45:01]

a switch (data[0]) might be more readable.

[Fady Samuel, 2013/07/23 19:40:52]

Done.

+    reportConnected();
+    return;
+  }
+
+  if (data[0] == 'start-confirm-dialog-test') {
+    var messageText = data[1];
+    reportConfirmDialogResult(messageText);
+    return;
+  }
+
+  if (data[0] == 'start-alert-dialog-test') {
+    var messageText = data[1];
+    reportAlertCompletion(messageText);
+    return;
+  }
+
+  if (data[0] == 'start-prompt-dialog-test') {
+    var messageText = data[1];
+    var defaultPromptText = data[2];
+    reportPromptDialogResult(messageText, defaultPromptText);
+    return;
+  }
+});