GitLab

This brings in:
5f8a503 Check m_nComponents when using JBIG2Decode
1d7dc1b Add m_pDocument in CPDF_Color and check if page date has been forced clear
49c41ac Tidy up opj_ callback functions in fx_codec_jpx_obj.cpp
9f810e7 Remove the GetValidBpc check in application callers and move it to where m_bpc is assigned.
d0c3650 Remove unused fields and stack locals.

TBR=thakis@chromium.org
TBR=inferno@chromium.org

Review URL: https://codereview.chromium.org/535623003

Cr-Commit-Position: refs/heads/master@{#293167}