Visual viewport API initial implementation.

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 144 matching lines @@
             'fileapi/FileError.idl',
             'fileapi/FileList.idl',
             'fileapi/FileReader.idl',
             'fileapi/FileReaderSync.idl',
             'frame/BarProp.idl',
             'frame/Console.idl',
             'frame/ConsoleBase.idl',
             'frame/History.idl',
             'frame/ImageBitmap.idl',
             'frame/Location.idl',
+            'frame/VisualViewport.idl',
             'html/FormData.idl',
             'html/HTMLAllCollection.idl',
             'html/HTMLAnchorElement.idl',
             'html/HTMLAreaElement.idl',
             'html/HTMLAudioElement.idl',
             'html/HTMLBRElement.idl',
             'html/HTMLBaseElement.idl',
             'html/HTMLBodyElement.idl',
             'html/HTMLButtonElement.idl',
             'html/HTMLCollection.idl',
@@ skipping 3909 matching lines @@
             'svg/SVGPathParserTest.cpp',
             'svg/UnsafeSVGAttributeSanitizationTest.cpp',
             'testing/PrivateScriptTestTest.cpp',
             'timing/MemoryInfoTest.cpp',
             'workers/WorkerThreadTest.cpp',
             'workers/WorkerThreadTestHelper.h',
             'xml/parser/SharedBufferReaderTest.cpp',
         ],
     }
 }