Add support for persisting CompositionUnderlines in InputMethodController

third_party/WebKit/Source/core/editing/markers/DocumentMarker.h

Index: third_party/WebKit/Source/core/editing/markers/DocumentMarker.h
diff --git a/third_party/WebKit/Source/core/editing/markers/DocumentMarker.h b/third_party/WebKit/Source/core/editing/markers/DocumentMarker.h
index 06f90d4a9d9b801d5c207d81a848d0a6d113e0ad..040b222040a87c29bd14f592b0b0fe1f7c018c22 100644
--- a/third_party/WebKit/Source/core/editing/markers/DocumentMarker.h
+++ b/third_party/WebKit/Source/core/editing/markers/DocumentMarker.h
@@ -46,6 +46,7 @@ class CORE_EXPORT DocumentMarker : public GarbageCollected<DocumentMarker> {
     TextMatchMarkerIndex,
     InvisibleSpellcheckMarkerIndex,
     CompositionMarkerIndex,
+    PersistingCompositionMarkerIndex,
     MarkerTypeIndexesCount
   };
 
@@ -55,6 +56,7 @@ class CORE_EXPORT DocumentMarker : public GarbageCollected<DocumentMarker> {
     TextMatch = 1 << TextMatchMarkerIndex,
     InvisibleSpellcheck = 1 << InvisibleSpellcheckMarkerIndex,
     Composition = 1 << CompositionMarkerIndex,
+    PersistingComposition = 1 << PersistingCompositionMarkerIndex,
   };
 
   class MarkerTypes {
@@ -82,7 +84,8 @@ class CORE_EXPORT DocumentMarker : public GarbageCollected<DocumentMarker> {
    public:
     AllMarkers()
         : MarkerTypes(Spelling | Grammar | TextMatch | InvisibleSpellcheck |
-                      Composition) {}
+                      Composition |
+                      PersistingComposition) {}
   };
 
   class MisspellingMarkers : public MarkerTypes {
@@ -106,7 +109,8 @@ class CORE_EXPORT DocumentMarker : public GarbageCollected<DocumentMarker> {
                  unsigned endOffset,
                  Color underlineColor,
                  bool thick,
-                 Color backgroundColor);
+                 Color backgroundColor,
+                 bool persist);
 
   DocumentMarker(const DocumentMarker&);