Blink ScrollbarThemes

ScrollbarTheme class hierarchy

ScrollbarTheme

|

|--- ScrollbarThemeMacCommon

| |--- ScrollbarThemeMacNonOverlayAPI

| \--- ScrollbarThemeMacOverlayAPI

|

|--- ScrollbarThemeNonMacCommon

| |--- ScrollbarThemeAuraOrGtk

| \--- ScrollbarThemeWin

|

\--- ScrollbarThemeOverlay

ScrollbarThemeOverlay is used by Android and optionally by Aura or GTK+.

Future work:

• Perhaps try to consolidate the various overlay scrollbar classes so Mac and non-Mac can share.

• Once Windows switches to Aura, we can remove ScrollbarThemeWin and ScrollbarThemeNonMacCommon.