Fix mus-in-renderer scale factor crash
Currently --mus-in-renderer crashes the renderer process on startup. The
WindowTreeClient attempts to check the display scale factor, but the screen
is not being set in that process.
This change returns a default scale factor when there is no available screen.
This will become redundant once aura-mus is ready, as proper screens will
be available.
TEST=manually ran --mus-in-renderer renderer works and paints.
BUG=631270
Review-Url: https://codereview.chromium.org/2540773002
Cr-Commit-Position: refs/heads/master@{#435102}
1 file changed
