<webview>: Context menu API implementation CL.

chrome/browser/guestview/webview/webview_guest.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 CHROME_BROWSER_GUESTVIEW_WEBVIEW_WEBVIEW_GUEST_H_
 #define CHROME_BROWSER_GUESTVIEW_WEBVIEW_WEBVIEW_GUEST_H_
 
 #include "base/observer_list.h"
 #include "chrome/browser/extensions/tab_helper.h"
 #include "chrome/browser/guestview/guestview.h"
@@ skipping 20 matching lines @@
 // a particular <webview>.
 class WebViewGuest : public GuestView,
                      public content::NotificationObserver,
                      public content::WebContentsObserver {
  public:
   WebViewGuest(content::WebContents* guest_web_contents,
                const std::string& embedder_extension_id);
 
   static WebViewGuest* From(int embedder_process_id, int instance_id);
   static WebViewGuest* FromWebContents(content::WebContents* contents);
+  // Returns guestview::kInstanceIDNone if |contents| does not correspond to a
+  // WebViewGuest.
+  static int GetViewInstanceId(content::WebContents* contents);
 
   // GuestView implementation.
   virtual void Attach(content::WebContents* embedder_web_contents,
                       const base::DictionaryValue& args) OVERRIDE;
   virtual GuestView::Type GetViewType() const OVERRIDE;
   virtual WebViewGuest* AsWebView() OVERRIDE;
   virtual AdViewGuest* AsAdView() OVERRIDE;
 
   // GuestDelegate implementation.
   virtual void AddMessageToConsole(int32 level,
@@ skipping 203 matching lines @@
 #if defined(OS_CHROMEOS)
   // Subscription to receive notifications on changes to a11y settings.
   scoped_ptr<chromeos::AccessibilityStatusSubscription>
       accessibility_subscription_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(WebViewGuest);
 };
 
 #endif  // CHROME_BROWSER_GUESTVIEW_WEBVIEW_WEBVIEW_GUEST_H_