DevTools: [Documentation] Add signature section for renderer

Drive-by fixes:
1) Fix constants documentation detection
2) Fix inherited Function methods problem

BUG=391593

Review URL: https://codereview.chromium.org/525363003

git-svn-id: svn://svn.chromium.org/blink/trunk@181648 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Fix crash when trying to iterate over words in an inline text box of length zero.

BUG=373885

Review URL: https://codereview.chromium.org/542553002

git-svn-id: svn://svn.chromium.org/blink/trunk@181649 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Test time complexity for page with large inlined script.

Relies on on async magnitude-perf API:
https://codereview.chromium.org/544453004/

Tests fix:
https://codereview.chromium.org/494993002/

BUG=410790

Review URL: https://codereview.chromium.org/500363002

git-svn-id: svn://svn.chromium.org/blink/trunk@181650 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Use failure.tree field provided by the builder_alerts generator

Depends on https://codereview.chromium.org/508873005/.

BUG=406969
R=ojan@chromium.org

Review URL: https://codereview.chromium.org/511253004

git-svn-id: svn://svn.chromium.org/blink/trunk@181652 bbb929c8-8fbe-4397-9dbb-9b2b20218538
MIDIAccess::create(): add missing adoptRefCountedGarbageCollected().

R=ager@chromium.org,haraken@chromium.org
BUG=340522

Review URL: https://codereview.chromium.org/552143003

git-svn-id: svn://svn.chromium.org/blink/trunk@181653 bbb929c8-8fbe-4397-9dbb-9b2b20218538