Basic use implementation for MediaStream from Canvas: captureStream()

third_party/WebKit/Source/platform/blink_platform.gypi

 {
   'includes': [
     'platform_generated.gypi',
   ],
   'variables': {
     'platform_files': [
       'AsyncFileSystemCallbacks.h',
       'CalculationValue.h',
       'CheckedInt.h',
       'Clock.cpp',
@@ skipping 316 matching lines @@
       'exported/WebScrollbarThemePainter.cpp',
       'exported/WebSecurityOrigin.cpp',
       'exported/WebServicePortProviderClient.cpp',
       'exported/WebServiceWorkerProviderClient.cpp',
       'exported/WebServiceWorkerProxy.cpp',
       'exported/WebServiceWorkerRequest.cpp',
       'exported/WebServiceWorkerResponse.cpp',
       'exported/WebSocketHandshakeRequestInfo.cpp',
       'exported/WebSocketHandshakeResponseInfo.cpp',
       'exported/WebSourceInfo.cpp',
+      'exported/WebSkImage.cpp',
       'exported/WebSpeechSynthesisUtterance.cpp',
       'exported/WebSpeechSynthesisVoice.cpp',
       'exported/WebSpeechSynthesizerClientImpl.cpp',
       'exported/WebSpeechSynthesizerClientImpl.h',
       'exported/WebStorageQuotaCallbacks.cpp',
       'exported/WebThreadSafeData.cpp',
       'exported/WebThreadedDataReceiver.cpp',
       'exported/WebTraceLocation.cpp',
       'exported/WebTransformKeyframe.cpp',
       'exported/WebURL.cpp',
@@ skipping 759 matching lines @@
       ['OS!="mac"',
         {
           'platform_test_files': [
             'scroll/ScrollAnimatorTest.cpp',
           ],
         }
       ],
     ],
   },
 }