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The GPU service code assumes that all textures uploads made directly
to shared image interface are 4 byte aligned. While this is true for
RGBA resources, which have 4 bytes per pixel, its not the case for
ALPHA_8 resources. A mismatch in the expected size causes the upload
to fail and the service side tears down the GL context.

This change fixes the above by ensuring that UI resource creation code
allocates and initializes the SkBitmaps with a 4 byte alignment.

Bug:1013992
R=kbr@chromium.org,skyostil@chromium.org

Change-Id: I2bd8e4ce7764573f2cc7b78ac8582346cf9baf7c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2093272Reviewed-by: David Trainor <dtrainor@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Reviewed-by: Sami Kyöstilä <skyostil@chromium.org>
Commit-Queue: Khushal <khushalsagar@chromium.org>
Auto-Submit: Khushal <khushalsagar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#749737}