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PaintOpReader::Read for SkData is used by 2 code-paths, deserializing
SkTextBlobs and AnnotateOps. While AnnotateOp needs to copy the SkData,
the copy for SkTextBlobs is completely unnecessary.

This also uncovered skia caching keyed on text blob ids in
GrAtlasTextContext, which we'll miss in OOP by re-serializing the text
blobs each time. This should be addressed by caching these on the
service side in a follow up.

R=enne@chromium.org
BUG: 821584

Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel;master.tryserver.chromium.android:android_optional_gpu_tests_rel
Change-Id: I77b47621e0f0bca225377968b02ca5f401804bc0
Reviewed-on: https://chromium-review.googlesource.com/959439
Commit-Queue: Khushal <khushalsagar@chromium.org>
Reviewed-by: enne <enne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543025}