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

components/plugins/renderer/plugin_placeholder.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_PLUGIN_PLACEHOLDER_H_
 #define COMPONENTS_PLUGINS_RENDERER_PLUGIN_PLACEHOLDER_H_
 
 #include "base/memory/weak_ptr.h"
 #include "components/plugins/renderer/webview_plugin.h"
 #include "content/public/renderer/render_frame_observer.h"
+#include "gin/handle.h"
 #include "gin/wrappable.h"
+#include "third_party/WebKit/public/web/WebKit.h"
 #include "third_party/WebKit/public/web/WebPluginParams.h"
 
 namespace plugins {
 
-class PluginPlaceholder : public content::RenderFrameObserver,
-                          public WebViewPlugin::Delegate,
-                          public gin::Wrappable<PluginPlaceholder> {
+// This abstract class is the base class of all plugin placeholders.
+class PluginPlaceholderBase : public content::RenderFrameObserver,
+                              public WebViewPlugin::Delegate {
  public:
-  static gin::WrapperInfo kWrapperInfo;
+  // |render_frame| and |frame| are weak pointers. If either one is going away,
+  // our |plugin_| will be destroyed as well and will notify us.
+  PluginPlaceholderBase(content::RenderFrame* render_frame,
+                        blink::WebLocalFrame* frame,
+                        const blink::WebPluginParams& params,
+                        const std::string& html_data);
+
+  ~PluginPlaceholderBase() override;
 
   WebViewPlugin* plugin() { return plugin_; }
 
  protected:
-  // |render_frame| and |frame| are weak pointers. If either one is going away,
-  // our |plugin_| will be destroyed as well and will notify us.
-  PluginPlaceholder(content::RenderFrame* render_frame,
-                    blink::WebLocalFrame* frame,
-                    const blink::WebPluginParams& params,
-                    const std::string& html_data,
-                    GURL placeholderDataUrl);
-
-  ~PluginPlaceholder() override;
-
   blink::WebLocalFrame* GetFrame();
   const blink::WebPluginParams& GetPluginParams() const;
 
   // WebViewPlugin::Delegate methods:
   void ShowContextMenu(const blink::WebMouseEvent&) override;
   void PluginDestroyed() override;
   v8::Local<v8::Object> GetV8ScriptableObject(
       v8::Isolate* isolate) const override;
 
+ protected:
+  // Hide this placeholder.
+  void HidePlugin();
+  bool hidden() { return hidden_; }
+
+  // JavaScript callbacks:
+  void HideCallback();
+
  private:
   // RenderFrameObserver methods:
   void OnDestruct() override;
 
   blink::WebLocalFrame* frame_;
   blink::WebPluginParams plugin_params_;
   WebViewPlugin* plugin_;
 
-  DISALLOW_COPY_AND_ASSIGN(PluginPlaceholder);
+  bool hidden_;
+
+  DISALLOW_COPY_AND_ASSIGN(PluginPlaceholderBase);
+};
+
+// A basic placeholder that supports only hiding.
+class PluginPlaceholder final : public PluginPlaceholderBase,
+                                public gin::Wrappable<PluginPlaceholder> {
+ public:
+  static gin::WrapperInfo kWrapperInfo;
+
+  PluginPlaceholder(content::RenderFrame* render_frame,
+                    blink::WebLocalFrame* frame,
+                    const blink::WebPluginParams& params,
+                    const std::string& html_data);
+  ~PluginPlaceholder() override;
+
+ private:
+  // WebViewPlugin::Delegate methods:
+  v8::Local<v8::Value> GetV8Handle(v8::Isolate* isolate) final;
+
+  // gin::Wrappable method:
+  gin::ObjectTemplateBuilder GetObjectTemplateBuilder(
+      v8::Isolate* isolate) override;
 };
 
 }  // namespace plugins
 
 #endif  // COMPONENTS_PLUGINS_RENDERER_PLUGIN_PLACEHOLDER_H_