Implement pointer lock API for out-of-process iframes.

content/browser/web_contents/web_contents_impl.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_BROWSER_WEB_CONTENTS_WEB_CONTENTS_IMPL_H_
 #define CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_IMPL_H_
 
 #include <stdint.h>
 
 #include <functional>
@@ skipping 1377 matching lines @@
   bool page_scale_factor_is_one_;
 
   // TextInputManager tracks the IME-related state for all the
   // RenderWidgetHostViews on this WebContents. Only exists on the outermost
   // WebContents and is automatically destroyed when a WebContents becomes an
   // inner WebContents by attaching to an outer WebContents. Then the
   // IME-related state for RenderWidgetHosts on the inner WebContents is tracked
   // by the TextInputManager in the outer WebContents.
   std::unique_ptr<TextInputManager> text_input_manager_;
 
+  // Stores the RenderWidgetHost that currently holds a mouse lock or nullptr if
+  // there's no RenderWidgetHost holding a lock.
+  RenderWidgetHostImpl* mouse_lock_widget_;
+
   base::WeakPtrFactory<WebContentsImpl> loading_weak_factory_;
   base::WeakPtrFactory<WebContentsImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(WebContentsImpl);
 };
 
 // Dangerous methods which should never be made part of the public API, so we
 // grant their use only to an explicit friend list (c++ attorney/client idiom).
 class CONTENT_EXPORT WebContentsImpl::FriendZone {
  private:
   friend class TestNavigationObserver;
   friend class WebContentsAddedObserver;
   friend class ContentBrowserSanityChecker;
 
   FriendZone();  // Not instantiable.
 
   // Adds/removes a callback called on creation of each new WebContents.
   static void AddCreatedCallbackForTesting(const CreatedCallback& callback);
   static void RemoveCreatedCallbackForTesting(const CreatedCallback& callback);
 
   DISALLOW_COPY_AND_ASSIGN(FriendZone);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_IMPL_H_