DevTools: WebSQL: add ability to hide columns.

Screenshot http://picpaste.com/pDHgQS9Z.png

BUG=272582

Review URL: https://codereview.chromium.org/794973003

git-svn-id: svn://svn.chromium.org/blink/trunk@187277 bbb929c8-8fbe-4397-9dbb-9b2b20218538
DevTools: [Elements] Display image currentSrc in the PICTURE's IMG popover

R=pfeldman
BUG=442337

Review URL: https://codereview.chromium.org/803913006

git-svn-id: svn://svn.chromium.org/blink/trunk@187278 bbb929c8-8fbe-4397-9dbb-9b2b20218538
DevTools: Remove a few global property access check suppressions

R=dgozman

Review URL: https://codereview.chromium.org/778193002

git-svn-id: svn://svn.chromium.org/blink/trunk@187280 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Devtools: Fix experiment name to remain sorted order
TBR=pfeldman
BUG=

Review URL: https://codereview.chromium.org/803173004

git-svn-id: svn://svn.chromium.org/blink/trunk@187311 bbb929c8-8fbe-4397-9dbb-9b2b20218538