compositor-worker: Introduce CompositorProxy.

Source/core/core.gypi

 {
     'includes': [
         'core_generated.gypi',
     ],
     'variables': {
         # Files for which bindings (.cpp and .h files) will be generated
         'core_idl_files': [
             'animation/Animation.idl',
             'animation/AnimationEffect.idl',
             'animation/AnimationNode.idl',
@@ skipping 29 matching lines @@
             'css/StyleSheetList.idl',
             'css/WebKitCSSMatrix.idl',
             'dom/ArrayBuffer.idl',
             'dom/ArrayBufferView.idl',
             'dom/Attr.idl',
             'dom/CDATASection.idl',
             'dom/CharacterData.idl',
             'dom/ClientRect.idl',
             'dom/ClientRectList.idl',
             'dom/Comment.idl',
+            'dom/CompositorProxy.idl',
             'dom/DOMError.idl',
             'dom/DOMException.idl',
             'dom/DOMImplementation.idl',
             'dom/DOMMatrix.idl',
             'dom/DOMMatrixReadOnly.idl',
             'dom/DOMPoint.idl',
             'dom/DOMPointReadOnly.idl',
             'dom/DOMRect.idl',
             'dom/DOMRectReadOnly.idl',
             'dom/DOMSettableTokenList.idl',
@@ skipping 2035 matching lines @@
             'dom/ChildNodeList.cpp',
             'dom/ChildNodeList.h',
             'dom/ClassCollection.cpp',
             'dom/ClassCollection.h',
             'dom/ClientRect.cpp',
             'dom/ClientRect.h',
             'dom/ClientRectList.cpp',
             'dom/ClientRectList.h',
             'dom/Comment.cpp',
             'dom/Comment.h',
+            'dom/CompositorProxy.cpp',
+            'dom/CompositorProxy.h',
             'dom/ContainerNode.cpp',
             'dom/ContextFeatures.cpp',
             'dom/ContextFeatures.h',
             'dom/ContextLifecycleNotifier.cpp',
             'dom/ContextLifecycleNotifier.h',
             'dom/ContextLifecycleObserver.h',
             'dom/CrossThreadTask.h',
             'dom/DOMArrayBuffer.cpp',
             'dom/DOMArrayBuffer.h',
             'dom/DOMArrayBufferDeallocationObserver.cpp',
@@ skipping 1691 matching lines @@
             'paint/LayoutObjectDrawingRecorderTest.cpp',
             'paint/TextPainterTest.cpp',
             'paint/ViewDisplayListTest.cpp',
             'streams/ReadableStreamReaderTest.cpp',
             'streams/ReadableStreamTest.cpp',
             'testing/PrivateScriptTestTest.cpp',
             'xml/parser/SharedBufferReaderTest.cpp',
         ],
     }
 }