DevTools: Move scroll beyond end of file support out of experiments.
R=lushnikov, pfeldman

Review URL: https://chromiumcodereview.appspot.com/23701012

git-svn-id: svn://svn.chromium.org/blink/trunk@157300 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Allow configuring CPU profiler sampling interval

Added a setting for selecting higher sampling rate for CPU profiler 0.1ms sampling interval vs. default 1ms one.

BUG=v8:2814
R=loislo@chromium.org

Review URL: https://codereview.chromium.org/23444035

git-svn-id: svn://svn.chromium.org/blink/trunk@157301 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Improve generic DOM exception messages.

BUG=270033

Review URL: https://chromiumcodereview.appspot.com/23533020

git-svn-id: svn://svn.chromium.org/blink/trunk@157302 bbb929c8-8fbe-4397-9dbb-9b2b20218538
DevTools: do not crash on protocol's getBoxModel for text elements

Review URL: https://chromiumcodereview.appspot.com/23452021

git-svn-id: svn://svn.chromium.org/blink/trunk@157303 bbb929c8-8fbe-4397-9dbb-9b2b20218538