Remove begin/end subseq. display items, and store on PaintController instead.

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

Index: third_party/WebKit/Source/platform/graphics/paint/DisplayItem.h
diff --git a/third_party/WebKit/Source/platform/graphics/paint/DisplayItem.h b/third_party/WebKit/Source/platform/graphics/paint/DisplayItem.h
index db334f2df4e0d3dc8988514ce80ddb0663a6dac3..f5fff7a9c6a57efe498bb6ebd714a5fd76094492 100644
--- a/third_party/WebKit/Source/platform/graphics/paint/DisplayItem.h
+++ b/third_party/WebKit/Source/platform/graphics/paint/DisplayItem.h
@@ -190,10 +190,6 @@ class PLATFORM_EXPORT DisplayItem {
     kEndTransform,
     kBeginClipPath,
     kEndClipPath,
-
-    kSubsequence,
-    kEndSubsequence,
-
     kUninitializedType,
     kTypeLast = kUninitializedType
   };
@@ -322,9 +318,7 @@ class PLATFORM_EXPORT DisplayItem {
 
   DEFINE_PAIRED_CATEGORY_METHODS(Transform3D, transform3D)
 
-  static bool isCacheableType(Type type) {
-    return isDrawingType(type) || type == kSubsequence;
-  }
+  static bool isCacheableType(Type type) { return isDrawingType(type); }
   bool isCacheable() const {
     return !skippedCache() && isCacheableType(m_type);
   }