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Looks like the crash in https://crbug.com/1086428 is because GrContext
is not initialized successfully, and then we are accessing the nullptr
GrContext, and then segment fault happens. Fix the problem by making
GetSharedContextState() return nullptr if GrContext cannot be
initialized.

Bug: 1086428
Change-Id: I288fc6832d6b0c838e16c119354e50db2ad2af80
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2214912
Commit-Queue: Peng Huang <penghuang@chromium.org>
Reviewed-by: Jonathan Backer <backer@chromium.org>
Auto-Submit: Peng Huang <penghuang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#771851}