Invalidation tests for :host-context.

Invalidation tests for :host-context.

We did not have any test coverage on :host-context and targeted style
recalc. Added a few tests.

R=chrishtr@chromium.org,esprehn@chromium.org

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=179999

[esprehn, 2014-08-11 20:43:40]

lgtm, not a huge fan of test_harness tests though since I need to read the
entire test to see what it does instead of looking at the expected output. You
also don't get a nice diff now, doesn't it just fail at the first wrong answer?

[rune, 2014-08-11 20:48:03]

On 2014/08/11 20:43:40, esprehn wrote:
> lgtm, not a huge fan of test_harness tests though since I need to read the
> entire test to see what it does instead of looking at the expected output. You
> also don't get a nice diff now, doesn't it just fail at the first wrong
answer?

Stops at the first failing assert per test(), yes.

[rune, 2014-08-11 20:48:13]

The CQ bit was checked by rune@opera.com

[commit-bot: I haz the power, 2014-08-11 20:48:32]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/rune@opera.com/458943002/1

[commit-bot: I haz the power, 2014-08-11 22:11:45]

Change committed as 179999