Introduce WebViewGuestDelegate.

extensions/browser/guest_view/web_view/web_view_guest_delegate.cc

Index: extensions/browser/guest_view/web_view/web_view_guest_delegate.cc
diff --git a/extensions/browser/guest_view/web_view/web_view_guest_delegate.cc b/extensions/browser/guest_view/web_view/web_view_guest_delegate.cc
new file mode 100644
index 0000000000000000000000000000000000000000..0c878fa6ca3cd84a65f3c8cc0ffc2a1a976d765a
--- /dev/null
+++ b/extensions/browser/guest_view/web_view/web_view_guest_delegate.cc
@@ -0,0 +1,32 @@
+// Copyright 2014 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 "extensions/browser/guest_view/web_view/web_view_guest_delegate.h"
+
+namespace extensions {
+
+WebViewGuestDelegate::WebViewGuestDelegate() {
+}
+
+WebViewGuestDelegate::~WebViewGuestDelegate() {
+}
+
+double WebViewGuestDelegate::GetZoom() {
+  return 1.0;
+}
+
+GuestViewBase::Event* WebViewGuestDelegate::OnHandleContextMenu(
+    const content::ContextMenuParams& params) {
+  return NULL;
+}
+
+GuestViewBase::Event* WebViewGuestDelegate::OnSetZoom(
+    double zoom_factor,
+    const std::string& old_zoom_factor,
+    const std::string& new_zoom_factor,
+    const std::string& event_zoom_change) {
+  return NULL;
+}
+
+}  // namespace extensions