Implement large cursors in Mushrome.

services/ui/ws/cursor_state.h

Index: services/ui/ws/cursor_state.h
diff --git a/services/ui/ws/cursor_state.h b/services/ui/ws/cursor_state.h
index b6af262b57eb644341c40243fc2f0ce02eab0358..7fd12c4308e7f93dfc12ecc509131041904bee5c 100644
--- a/services/ui/ws/cursor_state.h
+++ b/services/ui/ws/cursor_state.h
@@ -11,6 +11,9 @@
 #include "ui/base/cursor/cursor_data.h"
 
 namespace ui {
+
+enum class CursorSize;
+
 namespace ws {
 
 class DisplayManager;
@@ -36,11 +39,17 @@ class CursorState {
   // Sets a cursor globally, which overrides the per-window cursors.
   void SetGlobalOverrideCursor(const base::Optional<ui::CursorData>& cursor);
 
+  // Sets the cursor size.
+  void SetCursorSize(ui::CursorSize cursor_size);
+
  private:
   // A snapshot of the cursor state at a specific time.
   class StateSnapshot;
 
-  // Synchronizes |current_state_| with all the platform displays.
+  // Synchronizes cursor set data with all platform displays.
+  void SetPlatformCursorSize();
+
+  // Synchronizes the current cursor state with all the platform displays.
   void SetPlatformCursor();
 
   // Contains are the displays we notify on cursor changes.