Fixing crash of AnimationCompositorAnimationsTest.ConvertTimingForCompositorIterationCount on Android.

This patch reverts "Disable CoreAnimationCompositorAnimationsTest.ConvertTimingForCompositorIterationCount"
This reverts commit 6cfa03ad78ce5b46f0b78dfccc1ef503ad505654.

(Also merges the ConvertTimingForCompositorInfinite test into ConvertTimingForCompositorIterationCount.)

BUG=319674

Review URL: https://codereview.chromium.org/81733003

git-svn-id: svn://svn.chromium.org/blink/trunk@162509 bbb929c8-8fbe-4397-9dbb-9b2b20218538