Add a KeyboardLayoutEngine::SetCurrentLayoutFromBuffer implementation

ui/events/ozone/layout/keyboard_layout_engine.h

Index: ui/events/ozone/layout/keyboard_layout_engine.h
diff --git a/ui/events/ozone/layout/keyboard_layout_engine.h b/ui/events/ozone/layout/keyboard_layout_engine.h
index b03a0da3ec552846117750a3cbccadddb65c981f..97bd6491d425a9645131182ae7b875d60ae248e1 100644
--- a/ui/events/ozone/layout/keyboard_layout_engine.h
+++ b/ui/events/ozone/layout/keyboard_layout_engine.h
@@ -37,6 +37,10 @@ class EVENTS_OZONE_LAYOUT_EXPORT KeyboardLayoutEngine {
   // the argument string is defined by that interface (crbug.com/362698).
   virtual bool SetCurrentLayoutByName(const std::string& layout_name) = 0;
 
+  // Sets the current layout given a keyboard mapping description;
+  // Returns true on success.
+  virtual bool SetCurrentLayoutFromString(const std::string&) = 0;
+
   // Returns true if the current layout makes use of the ISO Level 5 Shift key.
   // Drop-in replacement for ImeKeyboard::IsISOLevel5ShiftAvailable().
   virtual bool UsesISOLevel5Shift() const = 0;