Implement Element.scrollIntoView for scroll-behavior: smooth.

third_party/WebKit/Source/platform/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//testing/libfuzzer/fuzzer_test.gni")
 import("//testing/test.gni")
 import("//third_party/WebKit/public/public_features.gni")
 import("//third_party/WebKit/Source/build/scripts/scripts.gni")
@@ skipping 1293 matching lines @@
     "scroll/ScrollbarThemeAura.cpp",
     "scroll/ScrollbarThemeAura.h",
     "scroll/ScrollbarThemeClient.h",
     "scroll/ScrollbarThemeMac.h",
     "scroll/ScrollbarThemeMac.mm",
     "scroll/ScrollbarThemeMock.cpp",
     "scroll/ScrollbarThemeMock.h",
     "scroll/ScrollbarThemeOverlay.cpp",
     "scroll/ScrollbarThemeOverlay.h",
     "scroll/ScrollbarThemeOverlayMock.h",
+    "scroll/SmoothScrollSequencer.cpp",
+    "scroll/SmoothScrollSequencer.h",
     "speech/PlatformSpeechSynthesisUtterance.cpp",
     "speech/PlatformSpeechSynthesisUtterance.h",
     "speech/PlatformSpeechSynthesisVoice.cpp",
     "speech/PlatformSpeechSynthesisVoice.h",
     "speech/PlatformSpeechSynthesizer.cpp",
     "speech/PlatformSpeechSynthesizer.h",
     "text/BidiCharacterRun.cpp",
     "text/BidiCharacterRun.h",
     "text/BidiContext.cpp",
     "text/BidiContext.h",
@@ skipping 836 matching lines @@
     "//third_party/WebKit/Source:config",
     "//third_party/WebKit/Source:inside_blink",
   ]
 
   deps = [
     ":test_support",
     "//testing/gmock",
     "//testing/gtest",
   ]
 }