Move renderer plugin code into a new component.

components/plugins/renderer/plugin_placeholder.h

Index: components/plugins/renderer/plugin_placeholder.h
diff --git a/components/plugins/renderer/plugin_placeholder.h b/components/plugins/renderer/plugin_placeholder.h
new file mode 100644
index 0000000000000000000000000000000000000000..753d9ee8decc227a144bc90a14a724acd9db7cf9
--- /dev/null
+++ b/components/plugins/renderer/plugin_placeholder.h
@@ -0,0 +1,115 @@
+// Copyright (c) 2012 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.
+
+#ifndef COMPONENTS_PLUGINS_RENDERER_PLUGIN_PLACEHOLDER_H_
+#define COMPONENTS_PLUGINS_RENDERER_PLUGIN_PLACEHOLDER_H_
+
+#include "components/plugins/renderer/webview_plugin.h"
+#include "content/public/common/webplugininfo.h"
+#include "content/public/renderer/context_menu_client.h"
+#include "content/public/renderer/render_process_observer.h"
+#include "content/public/renderer/render_view_observer.h"
+#include "third_party/WebKit/public/web/WebPluginParams.h"
+#include "webkit/renderer/cpp_bound_class.h"
+
+namespace content {
+struct WebPluginInfo;
+}
+
+namespace plugins {
+// Placeholders can be used if a plug-in is missing or not available
+// (blocked or disabled).
+class PluginPlaceholder : public content::RenderViewObserver,
+                          public webkit_glue::CppBoundClass,
+                          public WebViewPlugin::Delegate {
+ public:
+
+  WebViewPlugin* plugin() { return plugin_; }
+
+  void set_blocked_for_prerendering(bool blocked_for_prerendering) {
+    is_blocked_for_prerendering_ = blocked_for_prerendering;
+  }
+
+  void set_allow_loading(bool allow_loading) { allow_loading_ = allow_loading; }
+
+ protected:
+  // |render_view| and |frame| are weak pointers. If either one is going away,
+  // our |plugin_| will be destroyed as well and will notify us.
+  PluginPlaceholder(content::RenderView* render_view,
+                    WebKit::WebFrame* frame,
+                    const WebKit::WebPluginParams& params,
+                    const std::string& html_data,
+                    GURL placeholderDataUrl);
+
+  virtual ~PluginPlaceholder();
+
+  void OnLoadBlockedPlugins(const std::string& identifier);
+  void OnSetIsPrerendering(bool is_prerendering);
+
+  void SetMessage(const string16& message);
+  void SetPluginInfo(const content::WebPluginInfo& plugin_info);
+  const content::WebPluginInfo& GetPluginInfo() const;
+  void SetIdentifier(const std::string& identifier);
+  WebKit::WebFrame* GetFrame();
+  const WebKit::WebPluginParams& GetPluginParams() const;
+  bool LoadingAllowed() const { return allow_loading_; }
+
+  // Replace this placeholder with a different plugin (which could be
+  // a placeholder again).
+  void ReplacePlugin(WebKit::WebPlugin* new_plugin);
+
+  // Hide this placeholder.
+  void HidePlugin();
+
+  // Load the blocked plugin.
+  void LoadPlugin();
+
+  // WebViewPlugin::Delegate method:
+  virtual void BindWebFrame(WebKit::WebFrame* frame) OVERRIDE;
+
+ private:
+  // WebViewPlugin::Delegate methods:
+  virtual void WillDestroyPlugin() OVERRIDE;
+  virtual void ShowContextMenu(const WebKit::WebMouseEvent&) OVERRIDE;
+
+  // Javascript callbacks:
+  // All ignore arguments (which are, however, required by caller) and return
+  // nothing.
+
+  // Load the blocked plugin by calling LoadPlugin().
+  void LoadCallback(const webkit_glue::CppArgumentList& args,
+                    webkit_glue::CppVariant* result);
+
+  // Hide the blocked plugin by calling HidePlugin().
+  void HideCallback(const webkit_glue::CppArgumentList& args,
+                    webkit_glue::CppVariant* result);
+
+  void DidFinishLoadingCallback(const webkit_glue::CppArgumentList& args,
+                                webkit_glue::CppVariant* result);
+
+  void UpdateMessage();
+
+  WebKit::WebFrame* frame_;
+  WebKit::WebPluginParams plugin_params_;
+  WebViewPlugin* plugin_;
+
+  content::WebPluginInfo plugin_info_;
+
+  string16 message_;
+
+  // True iff the plugin was blocked because the page was being prerendered.
+  // Plugin will automatically be loaded when the page is displayed.
+  bool is_blocked_for_prerendering_;
+  bool allow_loading_;
+
+  bool hidden_;
+  bool finished_loading_;
+  std::string identifier_;
+
+  DISALLOW_COPY_AND_ASSIGN(PluginPlaceholder);
+};
+
+}  // namespace plugins
+
+#endif  // COMPONENTS_PLUGINS_RENDERER_PLUGIN_PLACEHOLDER_H_