Migrate blink_perf.animation mix-blend-mode-* to smoothness.tough_animation_cases

Migrate blink_perf.animation mix-blend-mode-* to smoothness.tough_animation_cases

This change moves the remaining blink_perf.animation tests to the
smoothness.tough_animation_cases benchmark. This changes them from using
main thread Javascript to approximate a FPS measurement to using proper
telemetry to measure animation performance.

BUG=490225
Committed: https://crrev.com/dbfa6951278248b90fe3499a3066cfbf0f0c6e68
Cr-Commit-Position: refs/heads/master@{#331518}

[alancutter (OOO until 2018), 2015-05-26 06:09:44]

alancutter@chromium.org changed reviewers:
+ nednguyen@google.com

[alancutter (OOO until 2018), 2015-05-26 06:15:09]

Submitted Android try run: https://codereview.chromium.org/1159453006

[nednguyen, 2015-05-26 17:01:51]

lgtm

If you have problem with smoothness metrics' noises, let me know. We can easily
shrink the range where we do smoothness measurement on the pages that we
control.

[alancutter (OOO until 2018), 2015-05-27 00:19:45]

The CQ bit was checked by alancutter@chromium.org

[commit-bot: I haz the power, 2015-05-27 00:23:22]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1156993002/20001

[commit-bot: I haz the power, 2015-05-27 03:05:59]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-05-27 03:06:48]

Patchset 2 (id:??) landed as
https://crrev.com/dbfa6951278248b90fe3499a3066cfbf0f0c6e68
Cr-Commit-Position: refs/heads/master@{#331518}