blink/bindings: ASAN checks to ensure proper ParkableString accesses.

A ParkableString underlying string memory should not be cached.
Following a suggestion by pasko@, add ASAN instrumentation to make sure
this is actually the case.

Bug: 877044
Change-Id: I463ad229b118f2e629b460f1a2beed41fc54b6a7
Reviewed-on: https://chromium-review.googlesource.com/1216422
Reviewed-by: Egor Pasko <pasko@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Benoit L <lizeb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#590251}
1 file changed