Added histograms to see if the interval between consecutive connects has
an impact on connect time.

R=jar@chromium.org
NOTRY=true

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=227233

Review URL: https://codereview.chromium.org/26098002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@227306 0039d316-1c4b-4281-b951-d872f2087c98
Extend test disabling for flaky webstore provider tests

Flaking on CrOS and Windows.

http://build.chromium.org/p/chromium.memory/builders/Linux%20Chromium%20OS%20ASAN%20Tests%20%283%29/builds/10517/steps/browser_tests/logs/SearchCache

BUG=246136
NOTRY=true

Review URL: https://codereview.chromium.org/26314002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@227307 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 227307