Using high resolution clock for IndexedDB perf tests.

This change will increase the accuracy (resolution) of the short
running tests (like testWalkingMultipleCursors_5) which typically
run in under 20 msec.

These JavaScript tests are used in both the old idb_perf (soon
to be deprecated) tests as well as the new indexeddb_perf tests
which supersede them.

R=sky@chromium.org

Review URL: https://codereview.chromium.org/99353004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@244593 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 244593
Fix Glib flag in GN build.

It had an extra underscore at the beginning.

R=thakis@chromium.org
TBR=thakis

Review URL: https://codereview.chromium.org/137303002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@244595 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 244595