Web Animations CSS: Support animation of fill-opacity

Note that we clamp values to the range 0-1, the existing implementation
incorrectly produces values outside this range. New behavior matches Gecko.

BUG=257591

Review URL: https://codereview.chromium.org/23542039

git-svn-id: svn://svn.chromium.org/blink/trunk@158601 bbb929c8-8fbe-4397-9dbb-9b2b20218538
core/platform/chromium/support/WebCrypto.cpp cannot depend on modules

Just needed another layer of virtual.

R=abarth
BUG=301947

Review URL: https://codereview.chromium.org/25417002

git-svn-id: svn://svn.chromium.org/blink/trunk@158602 bbb929c8-8fbe-4397-9dbb-9b2b20218538
DevTools: Add more decimal digits to the FlameChart scale

On extreme FlameChart zoom levels several adjacent grid labels might
become identical. The patch adds necessary decimal digits to make them
distinct.

Review URL: https://codereview.chromium.org/25303002

git-svn-id: svn://svn.chromium.org/blink/trunk@158603 bbb929c8-8fbe-4397-9dbb-9b2b20218538