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This change enables errorprone basic null checking.
The new flag will raise an error when a @Nullable
argument or variable is not checked before being used.

The code updates all sites that declared parameters as
@Nullable without subsequently checking their values to
@NonNull.

The change should help push forward the effort to enable
the NullAway errorprone extension

Bug: 1022427

Change-Id: I6c1e87d87fad98252c3cc3916e3a1034cf4eb8cc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2521294
Commit-Queue: Tomasz Wiszkowski <ender@google.com>
Reviewed-by: David Trainor <dtrainor@chromium.org>
Reviewed-by: Ted Choc <tedchoc@chromium.org>
Reviewed-by: Xing Liu <xingliu@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#825008}