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During the GPU Channel set up, we queue Cursor related IPC calls and
calls related to Widget delegate creation is done only after the channel
is established. This has a effect that the cursor related IPC calls are
handled first and then calls related to Widget delegate creation. However
ResetCursor expects WindowDelegate for the widget to be already
present. Now, we force the creation of WidgetDelegate in OnCursorSet.

This was causing a crash during startup.

Review URL: https://codereview.chromium.org/698793002

Cr-Commit-Position: refs/heads/master@{#302622}