Implemented Browser Plugin (NOT FOR REVIEW)

content/renderer/browser_plugin/browser_plugin_placeholder.h

-// 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 CONTENT_RENDERER_BROWSER_PLUGIN_BROWSER_PLUGIN_PLACEHOLDER_H_
-#define CONTENT_RENDERER_BROWSER_PLUGIN_BROWSER_PLUGIN_PLACEHOLDER_H_
-#pragma once
-
-#include "base/process.h"
-#include "ipc/ipc_channel_handle.h"
-#include "third_party/WebKit/Source/WebKit/chromium/public/platform/WebString.h"
-#include "third_party/WebKit/Source/WebKit/chromium/public/WebPluginParams.h"
-#include "ui/gfx/size.h"
-#include "webkit/plugins/webview_plugin.h"
-
-namespace content {
-class RenderView;
-}
-
-namespace WebKit {
-class WebPlugin;
-}
-
-// A browser plugin is a plugin container that hosts an out-of-process "guest"
-// RenderView. Loading up a new process, creating a new RenderView, navigating
-// to a given URL, and establishing a guest-to-host channel can take hundreds
-// of milliseconds. Furthermore, a RenderView's associated browser-side
-// WebContents, RenderViewHost, and SiteInstance must be created and accessed on
-// the UI thread of the browser process.
-//
-// To avoid blocking the host RenderView and to avoid introducing the potential
-// for deadlock, the BrowserPluginPlaceholder takes place of the guest
-// RenderView until the guest has established a connection with its host
-// RenderView. This permits loading the guest to happen asynchronously, while
-// the host RenderView is permitted to continue to receive and process events.
-class BrowserPluginPlaceholder: public webkit::WebViewPlugin::Delegate {
- public:
-  // Creates a new WebViewPlugin with a BrowserPluginPlaceholder as a delegate.
-  static webkit::WebViewPlugin* Create(
-      content::RenderView* render_view,
-      WebKit::WebFrame* frame,
-      const WebKit::WebPluginParams& params);
-
-  static BrowserPluginPlaceholder* FromID(int id);
-
-  void RegisterPlaceholder(int id, BrowserPluginPlaceholder* placeholder);
-  void UnregisterPlaceholder(int id);
-
-  int GetID() { return id_; }
-
-  webkit::WebViewPlugin* plugin() { return plugin_; }
-
-  const WebKit::WebPluginParams& plugin_params() const;
-
-  void GuestReady(base::ProcessHandle process_handle,
-                  const IPC::ChannelHandle& channel_handle);
-
-  content::RenderView* render_view() { return render_view_; }
-
- private:
-  BrowserPluginPlaceholder(content::RenderView* render_view,
-                           WebKit::WebFrame* frame,
-                           const WebKit::WebPluginParams& params,
-                           const std::string& html_data);
-  virtual ~BrowserPluginPlaceholder();
-
-  // Grabs the width, height, and source URL of the browser plugin
-  // from the element's attributes. If not found, it uses the defaults
-  // specified here as parameters.
-  void GetPluginParameters(int default_width, int default_height,
-                           const std::string& default_src);
-  // Replace this placeholder with the real browser plugin.
-  void LoadGuest(WebKit::WebPlugin* new_plugin);
-
-  virtual void BindWebFrame(WebKit::WebFrame* frame) OVERRIDE { }
-  virtual void WillDestroyPlugin() OVERRIDE;
-  virtual void ShowContextMenu(const WebKit::WebMouseEvent&) OVERRIDE { }
-
-  content::RenderView* render_view_;
-  WebKit::WebPluginParams plugin_params_;
-  webkit::WebViewPlugin* plugin_;
-  int id_;
-  gfx::Size size_;
-  std::string src_;
-
-  DISALLOW_COPY_AND_ASSIGN(BrowserPluginPlaceholder);
-};
-
-#endif  // CONTNET_RENDERER_BROWSER_PLUGIN_BROWSER_PLUGIN_PLACEHOLDER_H_