Revert of Plugins: Remove Shadow DOM Plugin Placeholder

chrome/renderer/plugins/shadow_dom_plugin_placeholder.cc

+// Copyright 2013 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/shadow_dom_plugin_placeholder.h"
+
+#include "base/command_line.h"
+#include "chrome/common/chrome_switches.h"
+#include "chrome/common/render_messages.h"
+#include "chrome/grit/generated_resources.h"
+#include "chrome/renderer/plugins/plugin_uma.h"
+#include "content/public/renderer/render_frame.h"
+#include "third_party/WebKit/public/web/WebDocument.h"
+#include "third_party/WebKit/public/web/WebLocalFrame.h"
+#include "third_party/WebKit/public/web/WebPluginParams.h"
+#include "ui/base/l10n/l10n_util.h"
+
+namespace {
+
+class MissingPluginPlaceholder : public blink::WebPluginPlaceholder {
+ public:
+  // blink::WebPluginPlaceholder overrides
+  blink::WebString message() const override {
+    // TODO(jbroman): IDS_PLUGIN_SEARCHING if ENABLE_PLUGIN_INSTALLATION
+    return l10n_util::GetStringUTF16(IDS_PLUGIN_NOT_SUPPORTED);
+  }
+};
+
+}  // namespace
+
+bool ShadowDOMPluginPlaceholderEnabled() {
+  return base::CommandLine::ForCurrentProcess()->HasSwitch(
+      switches::kEnablePluginPlaceholderShadowDom);
+}
+
+scoped_ptr<blink::WebPluginPlaceholder> CreateShadowDOMPlaceholderForPluginInfo(
+    content::RenderFrame* render_frame,
+    blink::WebLocalFrame* frame,
+    const blink::WebPluginParams& orig_params) {
+  using Status = ChromeViewHostMsg_GetPluginInfo_Status;
+
+  if (!ShadowDOMPluginPlaceholderEnabled())
+    return nullptr;
+
+  std::string orig_mime_type = orig_params.mimeType.utf8();
+  // TODO(jbroman): Investigate whether browser plugin needs special handling.
+  ChromeViewHostMsg_GetPluginInfo_Output output;
+#if defined(ENABLE_PLUGINS)
+  render_frame->Send(
+      new ChromeViewHostMsg_GetPluginInfo(render_frame->GetRoutingID(),
+                                          GURL(orig_params.url),
+                                          frame->top()->document().url(),
+                                          orig_mime_type,
+                                          &output));
+#else
+  output.status = Status::kNotFound;
+#endif
+
+  if (output.status == Status::kNotFound) {
+    // TODO(jbroman): Handle YouTube specially here, as in
+    // ChromeContentRendererClient::CreatePlugin.
+    PluginUMAReporter::GetInstance()->ReportPluginMissing(orig_mime_type,
+                                                          orig_params.url);
+    return CreateShadowDOMPlaceholderForMissingPlugin();
+  }
+
+  return nullptr;
+}
+
+scoped_ptr<blink::WebPluginPlaceholder>
+CreateShadowDOMPlaceholderForMissingPlugin() {
+  return make_scoped_ptr(new MissingPluginPlaceholder);
+}