FirstMeaningfulPaint UMA

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 2043 matching lines @@
             'paint/EmbeddedObjectPainter.cpp',
             'paint/EmbeddedObjectPainter.h',
             'paint/FieldsetPainter.cpp',
             'paint/FieldsetPainter.h',
             'paint/FileUploadControlPainter.cpp',
             'paint/FileUploadControlPainter.h',
             'paint/FilterEffectBuilder.cpp',
             'paint/FilterEffectBuilder.h',
             'paint/FilterPainter.cpp',
             'paint/FilterPainter.h',
+            'paint/FirstMeaningfulPaintDetector.cpp',
+            'paint/FirstMeaningfulPaintDetector.h',
             'paint/FloatClipRecorder.cpp',
             'paint/FloatClipRecorder.h',
             'paint/FramePainter.cpp',
             'paint/FramePainter.h',
             'paint/FrameSetPainter.cpp',
             'paint/FrameSetPainter.h',
             'paint/GridPainter.cpp',
             'paint/GridPainter.h',
             'paint/HTMLCanvasPainter.cpp',
             'paint/HTMLCanvasPainter.h',
@@ skipping 2162 matching lines @@
             'testing/PrivateScriptTestTest.cpp',
             'timing/MemoryInfoTest.cpp',
             'timing/PerformanceBaseTest.cpp',
             'timing/PerformanceObserverTest.cpp',
             'workers/WorkerThreadTest.cpp',
             'workers/WorkerThreadTestHelper.h',
             'xml/parser/SharedBufferReaderTest.cpp',
         ],
     }
 }