Enable shadow DOM-based "missing plugin" placeholder.

chrome/renderer/plugins/shadow_dom_plugin_placeholder.cc

Index: chrome/renderer/plugins/shadow_dom_plugin_placeholder.cc
diff --git a/chrome/renderer/plugins/shadow_dom_plugin_placeholder.cc b/chrome/renderer/plugins/shadow_dom_plugin_placeholder.cc
new file mode 100644
index 0000000000000000000000000000000000000000..ee694a8bfa55f10e0e8713b69872850928f453dd
--- /dev/null
+++ b/chrome/renderer/plugins/shadow_dom_plugin_placeholder.cc
@@ -0,0 +1,54 @@
+// 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 "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 CommandLine::ForCurrentProcess()->HasSwitch(
+      switches::kEnablePluginPlaceholderShadowDom);
+}
+
+scoped_ptr<blink::WebPluginPlaceholder>
+CreateShadowDOMPlaceholderForPluginInfo(
+    const ChromeViewHostMsg_GetPluginInfo_Output& output,
+    const blink::WebPluginParams& orig_params)
+{

[Bernhard Bauer, 2014/10/29 17:45:54]

Nit: Opening brace goes on the previous line.

[jbroman, 2014/10/29 18:14:40]

Whoops. Thought I'd run clang-format before uploading (to fix my
Blink-style-isms), but apparently not. Sorry about that. :(

+  using Status = ChromeViewHostMsg_GetPluginInfo_Status;
+  Status::Value status = output.status.value;
+  if (status == Status::kNotFound) {
+    // TODO(jbroman): Handle YouTube specially here, as in
+    // ChromeContentRendererClient::CreatePlugin.
+    PluginUMAReporter::GetInstance()->ReportPluginMissing(
+        orig_params.mimeType.utf8(), orig_params.url);
+    return CreateShadowDOMPlaceholderForMissingPlugin();
+  }
+
+  return nullptr;
+}
+
+scoped_ptr<blink::WebPluginPlaceholder>
+CreateShadowDOMPlaceholderForMissingPlugin() {
+  return make_scoped_ptr(new MissingPluginPlaceholder);
+}