Add delegate to install web_contents helpers for MimeHandlerView.

chrome/browser/guest_view/mime_handler_view/chrome_mime_handler_view_guest_delegate.cc

Index: chrome/browser/guest_view/mime_handler_view/chrome_mime_handler_view_guest_delegate.cc
diff --git a/chrome/browser/guest_view/mime_handler_view/chrome_mime_handler_view_guest_delegate.cc b/chrome/browser/guest_view/mime_handler_view/chrome_mime_handler_view_guest_delegate.cc
new file mode 100644
index 0000000000000000000000000000000000000000..22061509c4633f2b06f2b4922c116600ca30ee9a
--- /dev/null
+++ b/chrome/browser/guest_view/mime_handler_view/chrome_mime_handler_view_guest_delegate.cc
@@ -0,0 +1,43 @@
+// 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 "chrome/browser/guest_view/mime_handler_view/chrome_mime_handler_view_guest_delegate.h"
+
+#include "chrome/browser/ui/pdf/chrome_pdf_web_contents_helper_client.h"
+#include "components/pdf/browser/pdf_web_contents_helper.h"
+#include "extensions/browser/guest_view/mime_handler_view/mime_handler_view_guest.h"
+
+#if defined(ENABLE_PRINTING)
+#if defined(ENABLE_FULL_PRINTING)
+#include "chrome/browser/printing/print_preview_message_handler.h"
+#include "chrome/browser/printing/print_view_manager.h"
+#else
+#include "chrome/browser/printing/print_view_manager_basic.h"
+#endif  // defined(ENABLE_FULL_PRINTING)
+#endif  // defined(ENABLE_PRINTING)
+
+ChromeMimeHandlerViewGuestDelegate::ChromeMimeHandlerViewGuestDelegate(
+    extensions::MimeHandlerViewGuest* guest)
+    : extensions::MimeHandlerViewGuestDelegate(guest), guest_(guest) {
+}
+
+ChromeMimeHandlerViewGuestDelegate::~ChromeMimeHandlerViewGuestDelegate() {
+}
+
+// TODO(lazyboy): Investigate ways to move this out to /extensions.
+void ChromeMimeHandlerViewGuestDelegate::AttachHelpers() {
+  content::WebContents* web_contents = guest_->web_contents();
+#if defined(ENABLE_PRINTING)
+#if defined(ENABLE_FULL_PRINTING)
+  printing::PrintViewManager::CreateForWebContents(web_contents);
+  printing::PrintPreviewMessageHandler::CreateForWebContents(web_contents);
+#else
+  printing::PrintViewManagerBasic::CreateForWebContents(web_contents);
+#endif  // defined(ENABLE_FULL_PRINTING)
+#endif  // defined(ENABLE_PRINTING)
+  pdf::PDFWebContentsHelper::CreateForWebContentsWithClient(
+      web_contents,
+      scoped_ptr<pdf::PDFWebContentsHelperClient>(
+          new ChromePDFWebContentsHelperClient()));
+}