Expose APIs for text track settings

Source/web/WebSettingsImpl.h

Index: Source/web/WebSettingsImpl.h
diff --git a/Source/web/WebSettingsImpl.h b/Source/web/WebSettingsImpl.h
index ce8b35c84f787625e79cef8fcb4c21221683cf39..29af25af2d4e5aee090c05545d6d59649071b06e 100644
--- a/Source/web/WebSettingsImpl.h
+++ b/Source/web/WebSettingsImpl.h
@@ -158,6 +158,14 @@ public:
     virtual void setTextAreasAreResizable(bool) override;
     virtual void setTextAutosizingEnabled(bool) override;
     virtual void setAccessibilityFontScaleFactor(float) override;
+    virtual void setTextTrackBackgroundColor(const WebString&);
+    virtual void setTextTrackFontFamily(const WebString&);
+    virtual void setTextTrackFontStyle(const WebString&);
+    virtual void setTextTrackFontVariant(const WebString&);
+    virtual void setTextTrackTextColor(const WebString&);
+    virtual void setTextTrackTextShadow(const WebString&);
+    virtual void setTextTrackTextSize(const WebString&);
+    virtual void setTextTrackWindowColor(const WebString&);
     virtual void setThreadedScrollingEnabled(bool) override;
     virtual void setTouchDragDropEnabled(bool) override;
     virtual void setTouchEditingEnabled(bool) override;