Move ObjectInstance and Snapshot registration to the base class
Group async slices using viewSubGroupTitle
Make AsyncSlices should use the Event type registry.
When a category is missing in Android parser, provide a default value instead of using undefined.
Add category support to event registrar
Add net/ and NetAsyncSlice subtype
Fix Overlapping Nestable Async Slices
Merge pull request #641 from xunjieli/overlappingSliceFix

Fix overlapping slices
use NetAsyncSlice for disabled-by-default-netlog category
Merge pull request #643 from xunjieli/disabled-by-default-netlog

use NetAsyncSlice for disabled-by-default-netlog category