Split StyleSurroundData::offset into separate members.

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

Index: third_party/WebKit/Source/core/style/ComputedStyle.cpp
diff --git a/third_party/WebKit/Source/core/style/ComputedStyle.cpp b/third_party/WebKit/Source/core/style/ComputedStyle.cpp
index 08720ae4b90cfe764ad1910260a44adf9e7d3fff..a5468d8b0bdeb118da6e6ed8b16f2edbe8cfe09f 100644
--- a/third_party/WebKit/Source/core/style/ComputedStyle.cpp
+++ b/third_party/WebKit/Source/core/style/ComputedStyle.cpp
@@ -560,7 +560,7 @@ StyleDifference ComputedStyle::visualInvalidationDiff(
   }
 
   if (!diff.needsFullLayout() && position() != EPosition::kStatic &&
-      m_surround->offset != other.m_surround->offset) {
+      !offsetEqual(other)) {
     // Optimize for the case where a positioned layer is moving but not changing
     // size.
     if (dependenceOnContentHeightHasChanged(*this, other))
@@ -609,8 +609,7 @@ bool ComputedStyle::scrollAnchorDisablingPropertyChanged(
   }
 
   if (m_surround.get() != other.m_surround.get()) {
-    if (m_surround->margin != other.m_surround->margin ||
-        m_surround->offset != other.m_surround->offset ||
+    if (m_surround->margin != other.m_surround->margin || !offsetEqual(other) ||
         m_surround->padding != other.m_surround->padding)
       return true;
   }