Move <webview> API to chrome layer

chrome/browser/browser_plugin/chrome_browser_plugin_guest_observer.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/browser_plugin/chrome_browser_plugin_guest_observer.h"
+
+#include <stdio.h>
+
+#include "base/files/file_path.h"
+#include "base/values.h"
+#include "chrome/browser/extensions/extension_service.h"
+#include "chrome/common/chrome_browser_plugin_messages.h"
+#include "chrome/common/extensions/api/tabs.h"
+#include "chrome/common/extensions/extension_messages.h"
+#include "chrome/common/extensions/value_builder.h"
+#include "content/public/browser/browser_plugin/browser_plugin_guest.h"
+#include "content/public/browser/web_contents.h"
+
+ChromeBrowserPluginGuestObserver::ChromeBrowserPluginGuestObserver(
+    content::BrowserPluginGuest* guest)
+    : content::BrowserPluginGuestObserver(guest) {
+  AddRef();
+}
+
+ChromeBrowserPluginGuestObserver::~ChromeBrowserPluginGuestObserver() {
+}
+
+void ChromeBrowserPluginGuestObserver::OnDestruct() {
+  Release();
+}
+
+bool ChromeBrowserPluginGuestObserver::OnMessageReceivedFromEmbedder(
+    const IPC::Message& message) {
+  bool handled = true;
+  IPC_BEGIN_MESSAGE_MAP(ChromeBrowserPluginGuestObserver, message)
+    IPC_MESSAGE_HANDLER(ChromeBrowserPluginHostMsg_Go, OnGo)
+    IPC_MESSAGE_UNHANDLED(handled = false)
+  IPC_END_MESSAGE_MAP()
+  return handled;
+}
+
+void ChromeBrowserPluginGuestObserver::OnGo(int relative_index) {
+  browser_plugin_guest()->GetWebContents()->GetController().GoToOffset(
+      relative_index);
+}
+
+