| Index: third_party/WebKit/Source/core/core.gypi | 
| diff --git a/third_party/WebKit/Source/core/core.gypi b/third_party/WebKit/Source/core/core.gypi | 
| index 373aee188f55f81e2f6ed82f52169d047791f449..c8d5b29e670fe1c9876acd348b5b1c4b1be14b9c 100644 | 
| --- a/third_party/WebKit/Source/core/core.gypi | 
| +++ b/third_party/WebKit/Source/core/core.gypi | 
| @@ -259,6 +259,9 @@ | 
| 'input/InputDeviceCapabilities.idl', | 
| 'inspector/InspectorOverlayHost.idl', | 
| 'loader/appcache/ApplicationCache.idl', | 
| +            'observer/ResizeObserver.idl', | 
| +            'observer/ResizeObserverCallback.idl', | 
| +            'observer/ResizeObserverEntry.idl', | 
| 'page/EventSource.idl', | 
| 'page/PagePopupController.idl', | 
| 'page/scrolling/ScrollState.idl', | 
| @@ -2842,6 +2845,11 @@ | 
| 'input/TouchActionUtil.h', | 
| 'input/TouchEventManager.cpp', | 
| 'input/TouchEventManager.h', | 
| +            'observer/ResizeObserver.h', | 
| +            'observer/ResizeObserver.cpp', | 
| +            'observer/ResizeObserverCallback.h', | 
| +            'observer/ResizeObserverEntry.h', | 
| +            'observer/ResizeObserverEntry.cpp', | 
| ], | 
| 'webcore_html_files': [ | 
| 'html/AutoplayExperimentHelper.cpp', | 
|  |