[Android] Upstream remaining changes to NTP UI code.

chrome/browser/ui/webui/ntp/android/new_tab_page_ready_handler.cc

+// Copyright (c) 2012 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.
+
+#include "chrome/browser/ui/webui/ntp/android/new_tab_page_ready_handler.h"
+
+#include "base/bind.h"
+#include "base/logging.h"
+#include "base/values.h"
+#include "chrome/common/chrome_notification_types.h"
+#include "content/public/browser/notification_service.h"
+#include "content/public/browser/web_contents.h"
+#include "content/public/browser/web_ui.h"
+
+NewTabPageReadyHandler::NewTabPageReadyHandler() {
+}
+
+NewTabPageReadyHandler::~NewTabPageReadyHandler() {
+}
+
+void NewTabPageReadyHandler::RegisterMessages() {
+  web_ui()->RegisterMessageCallback("notifyNTPReady", base::Bind(
+      &NewTabPageReadyHandler::HandleNewTabPageReady, base::Unretained(this)));
+  web_ui()->RegisterMessageCallback("NTPUnexpectedNavigation", base::Bind(

[Evan Stade, 2012/10/02 14:42:43]

why does this exist? just to make tests fail? You should just console.error()
and make sure the tests fail when there's an error (some webui tests already
do).

[newt (away), 2012/10/05 13:31:05]

Yes, it's for tests.  Many of our tests start by loading the NTP and then
navigating to a new page.  These tests hang or break in strange ways if the NTP
does extra navigation after sending notifyNTPReady.

These tests are changing quite a bit right now, so this callback might not even
be required in the near future.  I can file a bug to track this for future
fixing or marking obsolete.  Is that reasonable?

[Evan Stade, 2012/10/05 15:16:13]

sure

[newt (away), 2012/10/05 15:38:33]

filed http://crbug.com/154307

+      &NewTabPageReadyHandler::HandleNewTabPageUnexpectedNavigation,
+      base::Unretained(this)));
+}
+
+void NewTabPageReadyHandler::HandleNewTabPageReady(
+    const ListValue* args) {
+  content::NotificationService::current()->Notify(
+      chrome::NOTIFICATION_NEW_TAB_READY,
+      content::Source<content::WebContents>(web_ui()->GetWebContents()),
+      content::NotificationService::NoDetails());
+}
+
+void NewTabPageReadyHandler::HandleNewTabPageUnexpectedNavigation(
+    const ListValue* args) {
+  // NTP reached an unexpected state trying to send finish loading notification
+  // a second time.  The notification should be sent only when page is
+  // completely done loading. This could otherwise create a race condition in
+  // tests waiting for the NTP to have loaded (any navigation NTP does after
+  // loading could interfere with the test navigation).
+  NOTREACHED();
+}