Delegates for the printing component

chrome/renderer/printing/chrome_print_web_view_helper_delegate.cc

+// Copyright 2015 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/renderer/printing/chrome_print_web_view_helper_delegate.h"
+
+#include "chrome/common/render_messages.h"
+#include "chrome/renderer/prerender/prerender_helper.h"
+#include "content/public/renderer/render_view.h"
+#include "ipc/ipc_message.h"
+#include "third_party/WebKit/public/web/WebDocument.h"
+#include "third_party/WebKit/public/web/WebElement.h"
+#include "third_party/WebKit/public/web/WebLocalFrame.h"
+
+#if defined(ENABLE_EXTENSIONS)
+#include "chrome/common/extensions/extension_constants.h"
+#include "extensions/common/constants.h"
+#endif  // defined(ENABLE_EXTENSIONS)
+
+ChromePrintWebViewHelperDelegate::~ChromePrintWebViewHelperDelegate(){
+}
+
+bool ChromePrintWebViewHelperDelegate::CancelPrerender(
+    content::RenderView* render_view, int routing_id) {
+  if (!render_view || !prerender::PrerenderHelper::IsPrerendering(
+      render_view->GetMainRenderFrame()))
+    return false;
+
+  return render_view->Send(
+      new ChromeViewHostMsg_CancelPrerenderForPrinting(routing_id));
+}
+
+// Return the PDF object element if |frame| is the out of process PDF extension.
+blink::WebElement ChromePrintWebViewHelperDelegate::GetPdfElement(
+        blink::WebLocalFrame* frame) {
+#if defined(ENABLE_EXTENSIONS)
+  GURL url = frame->document().url();
+  if (url.SchemeIs(extensions::kExtensionScheme) &&
+      url.host() == extension_misc::kPdfExtensionId) {
+    // <object> with id="plugin" is created in
+    // chrome/browser/resources/pdf/pdf.js.
+    auto plugin_element = frame->document().getElementById("plugin");
+    if (!plugin_element.isNull()) {
+      return plugin_element;
+    }
+    NOTREACHED();
+  }
+#endif  // defined(ENABLE_EXTENSIONS)
+  return blink::WebElement();
+}