Compute effective touch action in StyleAdjuster.

third_party/WebKit/Source/core/style/ComputedStyle.h

Index: third_party/WebKit/Source/core/style/ComputedStyle.h
diff --git a/third_party/WebKit/Source/core/style/ComputedStyle.h b/third_party/WebKit/Source/core/style/ComputedStyle.h
index ba9c457a87b60c5070bca829e03f7c05f570c417..46a53a0512abbd9f60ec49a7c283cc988d1094e0 100644
--- a/third_party/WebKit/Source/core/style/ComputedStyle.h
+++ b/third_party/WebKit/Source/core/style/ComputedStyle.h
@@ -1505,9 +1505,16 @@ class CORE_EXPORT ComputedStyle : public ComputedStyleBase,
   TouchAction GetTouchAction() const {
     return static_cast<TouchAction>(rare_non_inherited_data_->touch_action_);
   }
+  TouchAction GetEffectiveTouchAction() const {
+    return static_cast<TouchAction>(
+        rare_inherited_data_->effective_touch_action_);
+  }
   void SetTouchAction(TouchAction t) {
     SET_VAR(rare_non_inherited_data_, touch_action_, t);
   }
+  void SetEffectiveTouchAction(TouchAction t) {
+    SET_VAR(rare_inherited_data_, effective_touch_action_, t);
+  }
 
   // vertical-align
   static EVerticalAlign InitialVerticalAlign() {
@@ -2986,6 +2993,36 @@ class CORE_EXPORT ComputedStyle : public ComputedStyleBase,
            OverflowY() == EOverflow::kWebkitPagedY;
   }
 
+  bool IsDisplayTableRowOrColumnType() const {
+    return Display() == EDisplay::kTableRow ||
+           Display() == EDisplay::kTableRowGroup ||
+           Display() == EDisplay::kTableColumn ||
+           Display() == EDisplay::kTableColumnGroup;
+  }
+
+  bool HasAutoHorizontalScrollbar() const {

[flackr, 2017/06/08 19:35:21]

nit: We should avoid saying scrollbar, since it just may have a scrollbar and
this depends on HasOverflowClip. HasAutoHorizontalScroll perhaps?

[sunxd, 2017/06/09 21:00:35]

Done.

+    return OverflowX() == EOverflow::kAuto ||
+           OverflowX() == EOverflow::kOverlay;
+  }
+
+  bool HasAutoVerticalScrollbar() const {
+    return OverflowY() == EOverflow::kAuto ||
+           OverflowY() == EOverflow::kWebkitPagedY ||
+           OverflowY() == EOverflow::kOverlay;
+  }
+
+  bool ScrollsOverflowX() const {
+    return OverflowX() == EOverflow::kScroll || HasAutoHorizontalScrollbar();
+  }
+
+  bool ScrollsOverflowY() const {
+    return OverflowY() == EOverflow::kScroll || HasAutoVerticalScrollbar();
+  }
+
+  bool ScrollsOverflow() const {
+    return ScrollsOverflowX() || ScrollsOverflowY();
+  }
+
   // Visibility utility functions.
   bool VisibleToHitTesting() const {
     return Visibility() == EVisibility::kVisible &&