DevTools: add-to-watch shortcut

This patch adds shortcut Ctrl-Shift-A to the sources panel which
adds current selection to watch.

BUG=234954

Review URL: https://codereview.chromium.org/25521003

git-svn-id: svn://svn.chromium.org/blink/trunk@158806 bbb929c8-8fbe-4397-9dbb-9b2b20218538
DevTools: Highlight search result using text selection for long lines.

BUG=302277
R=lushnikov

Review URL: https://codereview.chromium.org/25844003

git-svn-id: svn://svn.chromium.org/blink/trunk@158807 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Rename ViewportArguments to ViewportDescription

The original name comes from the fact that the struct was filled with
info from parsing the viewport meta content attribute for key-value
pairs.

Today the struct is used for storing the description of the viewport
and can be filled either from the meta tag of from CSS @viewport
rules.

Review URL: https://codereview.chromium.org/25593006

git-svn-id: svn://svn.chromium.org/blink/trunk@158809 bbb929c8-8fbe-4397-9dbb-9b2b20218538