Show a new placeholder for PDF's when plugins are disabled.

chrome/renderer/plugins/pdf_plugin_placeholder.cc

Index: chrome/renderer/plugins/pdf_plugin_placeholder.cc
diff --git a/chrome/renderer/plugins/pdf_plugin_placeholder.cc b/chrome/renderer/plugins/pdf_plugin_placeholder.cc
new file mode 100644
index 0000000000000000000000000000000000000000..0fd1e9754a0e08a96e5714604b4459267b3d5264
--- /dev/null
+++ b/chrome/renderer/plugins/pdf_plugin_placeholder.cc
@@ -0,0 +1,32 @@
+// Copyright 2017 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/plugins/pdf_plugin_placeholder.h"
+
+#include "ui/base/resource/resource_bundle.h"
+#include "ui/base/webui/jstemplate_builder.h"
+
+gin::WrapperInfo PDFPluginPlaceholder::kWrapperInfo = {gin::kEmbedderNativeGin};
+
+PDFPluginPlaceholder::PDFPluginPlaceholder(content::RenderFrame* render_frame,
+                                           const blink::WebPluginParams& params,
+                                           const std::string& html_data)
+    : plugins::PluginPlaceholderBase(render_frame, params, html_data) {}
+
+PDFPluginPlaceholder::~PDFPluginPlaceholder() {}
+
+PDFPluginPlaceholder* PDFPluginPlaceholder::CreateBlockedPlugin(
+    content::RenderFrame* render_frame,
+    const blink::WebPluginParams& params,
+    int template_id) {
+  const base::StringPiece template_html(
+      ResourceBundle::GetSharedInstance().GetRawDataResource(template_id));
+  base::DictionaryValue values;
+  std::string html_data = webui::GetI18nTemplateHtml(template_html, &values);
+  return new PDFPluginPlaceholder(render_frame, params, html_data);
+}
+
+v8::Local<v8::Value> PDFPluginPlaceholder::GetV8Handle(v8::Isolate* isolate) {
+  return gin::CreateHandle(isolate, this).ToV8();
+}