In wasm debugger, show information about layer use to the user.
In wasm debugger, show information about layer use to the user.

Other minor performance optimizations, fixed problem with shortcut keys interfering with
the filter textbox.

Bug: skia:9626
Change-Id: I0ee53962a6a2c0b4f3b5958bbb29f0f4157cfdcc
Reviewed-on: https://skia-review.googlesource.com/c/buildbot/+/258249
Commit-Queue: Nathaniel Nifong <1ce561679465ea4956c6210637580cd7ba456816@google.com>
Reviewed-by: Kevin Lubick <7cdab2cfab351f23814786ba39716e90eed69047@google.com>

google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot