Added trace event to Resource::appendData. This is part of an effort to identify what contributes to the ~12.6% "uncategorized" time from the android top 25k experiment. For sites high in uncategorized time, this accounts for about 0.7% of the trace.

BUG=

Review URL: https://codereview.chromium.org/26908004

git-svn-id: svn://svn.chromium.org/blink/trunk@159456 bbb929c8-8fbe-4397-9dbb-9b2b20218538
IDL compiler: [DoNotCheckSecurity], [DoNotCheckSecurityOnGetter], [DoNotCheckSecurityOnSetter]

Docs:
https://sites.google.com/a/chromium.org/dev/blink/webidl/blink-idl-extended-attributes#TOC-DoNotCheckSecurity-m-a-

BUG=239771

Review URL: https://codereview.chromium.org/26645002

git-svn-id: svn://svn.chromium.org/blink/trunk@159457 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Clean up overloading of deltaX/deltaY in platform gesture events.

This is the last patch in the series to remove overloading
of deltaX/Y in gesture events.

BUG=143237

Review URL: https://codereview.chromium.org/23850013

git-svn-id: svn://svn.chromium.org/blink/trunk@159458 bbb929c8-8fbe-4397-9dbb-9b2b20218538