Output subsequence for children layers

third_party/WebKit/Source/platform/graphics/paint/DisplayItem.cpp

Index: third_party/WebKit/Source/platform/graphics/paint/DisplayItem.cpp
diff --git a/third_party/WebKit/Source/platform/graphics/paint/DisplayItem.cpp b/third_party/WebKit/Source/platform/graphics/paint/DisplayItem.cpp
index 59fd0fec4bc8a868591277e109e2bb0eac4c5448..8db534a74b288a0654ec1fc2231d78756545e3f9 100644
--- a/third_party/WebKit/Source/platform/graphics/paint/DisplayItem.cpp
+++ b/third_party/WebKit/Source/platform/graphics/paint/DisplayItem.cpp
@@ -154,6 +154,15 @@ static String transform3DTypeAsDebugString(DisplayItem::Type type)
     }
 }
 
+static String subsequenceTypeAsDebugString(DisplayItem::Type type)
+{
+    switch (type) {
+        DEBUG_STRING_CASE(SubsequenceNegativeZOrder);
+        DEBUG_STRING_CASE(SubsequenceNormalFlowAndPositiveZOrder);
+        DEFAULT_CASE;
+    }
+}
+
 WTF::String DisplayItem::typeAsDebugString(Type type)
 {
     if (isDrawingType(type))
@@ -181,6 +190,13 @@ WTF::String DisplayItem::typeAsDebugString(Type type)
     if (isEndTransform3DType(type))
         return "End" + transform3DTypeAsDebugString(endTransform3DTypeToTransform3DType(type));
 
+    if (isSubsequenceType(type))
+        return subsequenceTypeAsDebugString(type);
+    if (isEndSubsequenceType(type))
+        return "End" + subsequenceTypeAsDebugString(endSubsequenceTypeToSubsequenceType(type));
+    if (isCachedSubsequenceType(type))
+        return "Cached" + subsequenceTypeAsDebugString(cachedSubsequenceTypeToSubsequenceType(type));
+
     switch (type) {
         DEBUG_STRING_CASE(BeginFilter);
         DEBUG_STRING_CASE(EndFilter);
@@ -194,9 +210,6 @@ WTF::String DisplayItem::typeAsDebugString(Type type)
         DEBUG_STRING_CASE(EndFixedPosition);
         DEBUG_STRING_CASE(BeginFixedPositionContainer);
         DEBUG_STRING_CASE(EndFixedPositionContainer);
-        DEBUG_STRING_CASE(BeginSubsequence);
-        DEBUG_STRING_CASE(EndSubsequence);
-        DEBUG_STRING_CASE(CachedSubsequence);
         DEBUG_STRING_CASE(UninitializedType);
         DEFAULT_CASE;
     }