Fix unexpected blurry text caused by combination of skew and promotion

third_party/WebKit/Source/platform/graphics/CompositingReasons.h

Index: third_party/WebKit/Source/platform/graphics/CompositingReasons.h
diff --git a/third_party/WebKit/Source/platform/graphics/CompositingReasons.h b/third_party/WebKit/Source/platform/graphics/CompositingReasons.h
index 6bb667daa2d98974bc28fb8e50442ff6a52f8429..4ea90a1b52a4c921a4dfbb140c5c3db478debeb9 100644
--- a/third_party/WebKit/Source/platform/graphics/CompositingReasons.h
+++ b/third_party/WebKit/Source/platform/graphics/CompositingReasons.h
@@ -98,6 +98,10 @@ const uint64_t CompositingReasonInlineTransform = UINT64_C(1) << 50;
 
 const uint64_t CompositingReasonCompositorProxy = UINT64_C(1) << 51;
 
+// Composited elements with counter-skewed text
+const uint64_t CompositingReasonLayerForTextWithinSkewedPromotedElement =

[flackr, 2017/02/25 15:16:19]

nit: how about CompositingReasonSkewWithCompositedSkewedAncestor?

[yigu, 2017/02/27 22:03:42]

Done.

+    UINT64_C(1) << 52;
+
 // Various combinations of compositing reasons are defined here also, for more
 // intutive and faster bitwise logic.
 const uint64_t CompositingReasonComboAllDirectReasons =
@@ -136,7 +140,8 @@ const uint64_t CompositingReasonCombo3DDescendants =
 const uint64_t CompositingReasonComboAllStyleDeterminedReasons =
     CompositingReasonComboAllDirectStyleDeterminedReasons |
     CompositingReasonComboCompositedDescendants |
-    CompositingReasonCombo3DDescendants | CompositingReasonInlineTransform;
+    CompositingReasonCombo3DDescendants | CompositingReasonInlineTransform |
+    CompositingReasonLayerForTextWithinSkewedPromotedElement;
 
 const uint64_t CompositingReasonComboReasonsThatRequireOwnBacking =
     CompositingReasonComboAllDirectReasons | CompositingReasonOverlap |
@@ -153,7 +158,8 @@ const uint64_t CompositingReasonComboReasonsThatRequireOwnBacking =
                                                     // that 3d-transformed
                                                     // elements intersect.
     CompositingReasonBackdropFilter |
-    CompositingReasonPositionFixedWithCompositedDescendants;
+    CompositingReasonPositionFixedWithCompositedDescendants |
+    CompositingReasonLayerForTextWithinSkewedPromotedElement;
 
 const uint64_t CompositingReasonComboSquashableReasons =
     CompositingReasonOverlap | CompositingReasonAssumedOverlap |