- Introduce ScriptEventType enum
- Emit log event when deserializing scripts
- Better handle deserialized and eval scripts when calculating the byte size

Bug: chromium:757467, chromium:850038
Change-Id: I082161d8d1d4238a90d3607ca8b6b4e60f2f903e
Reviewed-on: https://chromium-review.googlesource.com/1114845
Commit-Queue: Camillo Bruni <cbruni@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Sathya Gunasekaran <gsathya@chromium.org>
Reviewed-by: Yang Guo <yangguo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54061}