DO NOT MERGE Prevent integer wrap around for malloc size when creating a SkRegion
DO NOT MERGE Prevent integer wrap around for malloc size when creating a SkRegion

Review URL: https://codereview.chromium.org/1143603003

Uses sk_64_mul instead of Sk64

bug:20883006
(cherry picked from commit 181f49c7acb67ad009f6deceb3b5cc0a45220ab4)

Change-Id: If93c6b957ea2f31b882cc272268700e415f724c5

F-AOSP/platform_external_skia,F-AOSP/platform_external_skia,F-AOSP/platform_external_skia,F-AOSP/platform_external_skia,F-AOSP/platform_external_skia,F-AOSP/platform_external_skia,F-AOSP/platform_external_skia,F-AOSP/platform_external_skia