OpenCL: Replace error-passing APIs to use angle::Result Part 2 of Issue 8435: This part replaces existing error handling for all CL APIs that return CL objects to now use "angle::Result". Bug: angleproject:8435 Change-Id: I75e41c7cbb06220cabec7cc9f9cb5107a3b6bd6d Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/5075773 Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org> Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org>