Adds scroll position/scale emulation to DevTools.

third_party/WebKit/Source/core/core.gypi

 {
     'includes': [
         'core_generated.gypi',
     ],
     'variables': {
         # Files for which bindings (.cpp and .h files) will be generated
         'core_idl_files': [
             'animation/KeyframeEffect.idl',
             'animation/EffectModel.idl',
             'animation/AnimationEffectReadOnly.idl',
@@ skipping 1782 matching lines @@
             'frame/RemoteDOMWindow.h',
             'frame/RemoteFrame.cpp',
             'frame/RemoteFrame.h',
             'frame/RemoteFrameClient.h',
             'frame/RemoteFrameView.cpp',
             'frame/RemoteFrameView.h',
             'frame/RootFrameViewport.cpp',
             'frame/RootFrameViewport.h',
             'frame/Screen.cpp',
             'frame/Screen.h',
+            'frame/ScrollAndScaleEmulator.cpp',
+            'frame/ScrollAndScaleEmulator.h',
             'frame/Settings.cpp',
             'frame/SettingsDelegate.cpp',
             'frame/SettingsDelegate.h',
             'frame/SmartClip.cpp',
             'frame/SmartClip.h',
             'frame/SubresourceIntegrity.cpp',
             'frame/SubresourceIntegrity.h',
             'frame/SuspendableTimer.cpp',
             'frame/SuspendableTimer.h',
             'frame/TopControls.cpp',
@@ skipping 2410 matching lines @@
             'testing/PrivateScriptTestTest.cpp',
             'timing/MemoryInfoTest.cpp',
             'timing/PerformanceBaseTest.cpp',
             'timing/PerformanceObserverTest.cpp',
             'workers/WorkerThreadTest.cpp',
             'workers/WorkerThreadTestHelper.h',
             'xml/parser/SharedBufferReaderTest.cpp',
         ],
     }
 }