Reland: Plugin Placeholders: Refactor for platforms that don't support plugins

components/plugins/renderer/webview_plugin.h

 // 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.
 
 #ifndef COMPONENTS_PLUGINS_RENDERER_WEBVIEW_PLUGIN_H_
 #define COMPONENTS_PLUGINS_RENDERER_WEBVIEW_PLUGIN_H_
 
 #include <list>
 
 #include "base/memory/scoped_ptr.h"
 #include "base/sequenced_task_runner_helpers.h"
 #include "third_party/WebKit/public/platform/WebCursorInfo.h"
 #include "third_party/WebKit/public/platform/WebString.h"
 #include "third_party/WebKit/public/platform/WebURLResponse.h"
 #include "third_party/WebKit/public/web/WebFrameClient.h"
+#include "third_party/WebKit/public/web/WebKit.h"
 #include "third_party/WebKit/public/web/WebPlugin.h"
 #include "third_party/WebKit/public/web/WebViewClient.h"
 
 namespace blink {
 class WebMouseEvent;
 }
 
 namespace content {
 class RenderView;
 struct WebPreferences;
 }
 
 namespace gfx {
 class Size;
 }
 
 // This class implements the WebPlugin interface by forwarding drawing and
 // handling input events to a WebView.
 // It can be used as a placeholder for an actual plugin, using HTML for the UI.
 // To show HTML data inside the WebViewPlugin,
 // call web_view->mainFrame()->loadHTMLString() with the HTML data and a fake
 // chrome:// URL as origin.
 
 class WebViewPlugin : public blink::WebPlugin,
                       public blink::WebViewClient,
                       public blink::WebFrameClient {
  public:
   class Delegate {
    public:
-    // Bind |frame| to a Javascript object, enabling the delegate to receive
-    // callback methods from Javascript inside the WebFrame.
-    // This method is called from WebFrameClient::didClearWindowObject.
-    virtual void BindWebFrame(blink::WebFrame* frame) = 0;
+    // Called to get the V8 handle used to bind the lifetime to the frame.
+    virtual v8::Local<v8::Value> GetV8Handle(v8::Isolate*) = 0;
 
     // Called upon a context menu event.
     virtual void ShowContextMenu(const blink::WebMouseEvent&) = 0;
 
     // Called when the WebViewPlugin is destroyed.
     virtual void PluginDestroyed() = 0;
 
     // Called to enable JavaScript pass-through to a throttled plugin, which is
     // loaded but idle. Doesn't work for blocked plugins, which is not loaded.
     virtual v8::Local<v8::Object> GetV8ScriptableObject(v8::Isolate*) const = 0;
@@ skipping 111 matching lines @@
 
   blink::WebURLResponse response_;
   std::list<std::string> data_;
   bool finished_loading_;
   scoped_ptr<blink::WebURLError> error_;
   blink::WebString old_title_;
   bool focused_;
 };
 
 #endif  // COMPONENTS_PLUGINS_RENDERER_WEBVIEW_PLUGIN_H_