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Following changes are done to the cgptlib API in order to allow backend component of fastboot to perform erase and write operations on partitions and manipulate GPT entries: GptFindNthEntry - Returns the nth entry in GPT that matches provided GUID. GptGetEntrySizeLba - Returns size of a partition in lba. GptGetEntrySizeBytes - Returns size of a partition in bytes. GptUpdateKernelWithEntry - Given kernel entry is updated using the provided update_type. GptUpdateKernelEntry calls this function with entry for current_kernel. Add flags GPT_UPDATE_ENTRY_RESET and GPT_UPDATE_ENTRY_INVALID for calls to GptUpdateKernelEntry. These operations are used by write image and erase partition respectively. BUG=chrome-os-partner:35861 BRANCH=None TEST=Compiles successfully and all the newly added functions work as expected. Change-Id: I82c87e4c97de2d207e80209dbd4922b4bcd5880a Signed-off-by: Furquan Shaikh <furquan@google.com> Reviewed-on: https://chromium-review.googlesource.com/240268 Trybot-Ready: Furquan Shaikh <furquan@chromium.org> Tested-by: Furquan Shaikh <furquan@chromium.org> Reviewed-by: Randall Spangler <rspangler@chromium.org> Reviewed-by: Aaron Durbin <adurbin@chromium.org> Commit-Queue: Furquan Shaikh <furquan@chromium.org>