- Add support to CPU/GPU convert vertex formats
- Add test cases for type conversion in angle_end2end_tests
- Fix a bug in shader script by adding a ceil when calculating bytes

Bug: angleproject:3192
Test: angle_end2end_tests --gtest_filter=VertexAttributeTest*Packed1010102*
Change-Id: I57bab9fc1c1041cd734746d0e52a33717b635ec0
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1788495Reviewed-by: Geoff Lang <geofflang@chromium.org>
Commit-Queue: Mohan Maiya <m.maiya@samsung.com>