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For displaying GBB images on panels with different dimension, X86 has VESA mode and VBIOS to scale automatically but ARM does not have such mode settings. If we install a larger panel on ARM platforms, current firmware will render the screens in left-top corner and leave black borders in right-bottom corner. To render images correctly, vboot library has to send out the expected dimension (similar to the VESA mode) so display provider can scale or shift images. BUG=chrome-os-partner:28494 TEST=emerge-nyan vboot_reference CQ-DEPEND=CL:199051,CL:199045 BRANCH=none Change-Id: I6d60f755ca2bcbd3135631d7624a8a4a4cff68b1 Reviewed-on: https://chromium-review.googlesource.com/199043 Reviewed-by: Bill Richardson <wfrichar@chromium.org> Tested-by: Hung-Te Lin <hungte@chromium.org> Commit-Queue: Hung-Te Lin <hungte@chromium.org>