Add support for persisting CompositionUnderlines in InputMethodController

third_party/WebKit/Source/core/editing/CompositionUnderline.h

Index: third_party/WebKit/Source/core/editing/CompositionUnderline.h
diff --git a/third_party/WebKit/Source/core/editing/CompositionUnderline.h b/third_party/WebKit/Source/core/editing/CompositionUnderline.h
index fc91fe8ddff087310907d68d21b4d6e1a0c924f1..a1a9251758bbcbf122d7493f64b598cb48e9fc93 100644
--- a/third_party/WebKit/Source/core/editing/CompositionUnderline.h
+++ b/third_party/WebKit/Source/core/editing/CompositionUnderline.h
@@ -40,13 +40,15 @@ class CORE_EXPORT CompositionUnderline {
                        unsigned endOffset,
                        const Color&,
                        bool thick,
-                       const Color& backgroundColor);
+                       const Color& backgroundColor,
+                       bool persist);
 
   unsigned startOffset() const { return m_startOffset; }
   unsigned endOffset() const { return m_endOffset; }
   const Color& color() const { return m_color; }
   bool thick() const { return m_thick; }
   const Color& backgroundColor() const { return m_backgroundColor; }
+  bool persist() const { return m_persist; }
 
  private:
   unsigned m_startOffset;
@@ -54,6 +56,7 @@ class CORE_EXPORT CompositionUnderline {
   Color m_color;
   bool m_thick;
   Color m_backgroundColor;
+  bool m_persist;
 };
 
 }  // namespace blink