Make ShellPortMash dispatch to cursor_manager in mus mode.
In mus mode, we forward commands to the window manager for the actual
rendering of cursors, but the monolith ash/chrome process otherwise
doesn't change. When in mus mode, ShellPort commands should be
dispatched to our local cursor_manager(), so that things which read back
the cursor state return the correct values.
They should only dispatch directly to the window manager in mash mode.
BUG=734806
Review-Url: https://codereview.chromium.org/2957313003
Cr-Commit-Position: refs/heads/master@{#483500}
3 files changed
