GitLab

This brings in:
f105b19 No need to release resources in destructor of CPDF_ShadingObject
fdcc874 Restrict index not be greater than row_size in TIFF_PredictLine
405478d Use valid bpc value in LoadPalette() and ContinueToLoadMask()
a67da71 Fix a bug when looping through m_pCompData
96f8786 Bounds check before fixed-size memcmp() in CJPX_Decoder::Init().

TBR=thakis@chromium.org

Review URL: https://codereview.chromium.org/515983005

Cr-Commit-Position: refs/heads/master@{#292502}