needsPaintInvalidation() should not return true for selection.

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

Index: third_party/WebKit/Source/core/style/StyleDifference.h
diff --git a/third_party/WebKit/Source/core/style/StyleDifference.h b/third_party/WebKit/Source/core/style/StyleDifference.h
index a646e54bb1e584102df98292b2971d1198e628bc..b9fba7a1ab10ce8ab4643bf5d95210b28ff14d84 100644
--- a/third_party/WebKit/Source/core/style/StyleDifference.h
+++ b/third_party/WebKit/Source/core/style/StyleDifference.h
@@ -52,7 +52,7 @@ class StyleDifference {
   }
 
   bool needsPaintInvalidation() const {

[mstensho (USE GERRIT), 2017/03/02 19:35:26]

Shouldn't this be renamed to needsFullPaintInvalidation() or something then?

[rune, 2017/03/03 09:13:09]

Done.

-    return m_paintInvalidationType != NoPaintInvalidation;
+    return m_paintInvalidationType > PaintInvalidationSelection;

[mstensho (USE GERRIT), 2017/03/02 19:35:26]

... and to make it more obvious that selection invalidation isn't full
invalidation, perhaps the enum value should be named
PaintInvalidationSelectionOnly?

[rune, 2017/03/03 09:13:09]

Done.

   }
 
   // The text selection needs paint invalidation.