Introduce WebViewGuestDelegate.

extensions/browser/guest_view/web_view/web_view_guest_delegate.h

+// Copyright 2014 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 EXTENSIONS_BROWSER_GUEST_VIEW_WEB_VIEW_WEB_VIEW_GUEST_DELEGATE_H_
+#define EXTENSIONS_BROWSER_GUEST_VIEW_WEB_VIEW_WEB_VIEW_GUEST_DELEGATE_H_
+
+#include "chrome/common/extensions/api/web_view_internal.h"
+#include "extensions/browser/guest_view/guest_view_base.h"
+
+namespace content {
+class RenderViewHost;
+class WebContents;
+}
+
+namespace extensions {
+
+namespace webview_api = api::web_view_internal;
+
+// A delegate class of WebViewGuest that are not a part of chrome.
+class WebViewGuestDelegate {

[Fady Samuel, 2014/08/20 14:45:09]

Methods here should be pure virtual. WebViewGuest should be able to handle the
case with a NULL delegate.

[Xi Han, 2014/08/20 15:46:01]

Done.

+ public :
+  WebViewGuestDelegate();
+  virtual ~WebViewGuestDelegate();
+
+  typedef std::vector<linked_ptr<webview_api::ContextMenuItem> > MenuItemVector;
+
+  // Returns the current zoom factor.
+  virtual double GetZoom();
+
+  virtual void InjectChromeVoxIfNeeded(
+      content::RenderViewHost* render_view_host) {}
+
+  // Called to attach helpers just after additional initialization is performed.
+  virtual void OnAttachWebViewHelpers(content::WebContents* contents) {}
+
+  // Called when the guest WebContents commits a provisional load in any frame.
+  virtual void OnDidCommitProvisionalLoadForFrame(bool is_main_frame) {}
+
+  // Called just after additional initialization is performed.
+  virtual void OnDidInitialize() {}
+
+  // Return a new event if the context menu operation was handled.
+  virtual extensions::GuestViewBase::Event* OnHandleContextMenu(
+      const content::ContextMenuParams& params);
+
+  // Called immediately after the guest WebContents has been destroyed.
+  virtual void OnGuestDestroyed() {}
+
+  // Called when to set the zoom factor.
+  virtual GuestViewBase::Event* OnSetZoom(
+      double zoom_factor,
+      const std::string& old_zoom_factor,
+      const std::string& new_zoom_factor,
+      const std::string& event_zoom_change);
+
+  // Shows the context menu for the guest.
+  // |items| acts as a filter. This restricts the current context's default
+  // menu items to contain only the items from |items|.
+  // |items| == NULL means no filtering will be applied.
+  virtual void OnShowContextMenu(
+      int request_id,
+      const MenuItemVector* items) {}
+
+  // Set current_zoom_factor.
+  virtual void SetCurrentZoomFactor(double zoom_factor) {}
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(WebViewGuestDelegate);
+};
+
+}  // namespace extensions
+
+#endif  // EXTENSIONS_BROWSER_GUEST_VIEW_WEB_VIEW_WEB_VIEW_GUEST_DELEGATE_H_