Move PageSizeAuto to ComputedStyleConstants.h.

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

Index: third_party/WebKit/Source/core/style/ComputedStyleConstants.h
diff --git a/third_party/WebKit/Source/core/style/ComputedStyleConstants.h b/third_party/WebKit/Source/core/style/ComputedStyleConstants.h
index 344ae1ae80e7997ce12e3114026ed11ca6f8676f..6843c8f06b7d994d16bd00f44ad4a6825a7dacda 100644
--- a/third_party/WebKit/Source/core/style/ComputedStyleConstants.h
+++ b/third_party/WebKit/Source/core/style/ComputedStyleConstants.h
@@ -428,6 +428,16 @@ enum ScrollSnapType {
 
 enum AutoRepeatType { kNoAutoRepeat, kAutoFill, kAutoFit };
 
+// Page size type.
+// StyleRareNonInheritedData::page_size_ is meaningful only when
+// StyleRareNonInheritedData::page_size_type_ is kResolved.
+enum class PageSizeType {
+  kAuto,       // size: auto
+  kLandscape,  // size: landscape
+  kPortrait,   // size: portrait
+  kResolved    // Size is fully resolved.
+};
+
 // In order to conserve memory, the border width uses fixed point,
 // which can be bitpacked.  This fixed point implementation is
 // essentially the same as in LayoutUnit.  Six bits are used for the