Fractional line coverage + logging change.

Add fractional line coverage + logging change.

Added fractional line coverage to line by line coverage information so that the fractional line coverage will be available in generated JSON files.

Changed logging level of skipped files.

BUG=

Committed: https://crrev.com/39bc8c2a5c6a7b9b4f97d2b29359e151b9ccf402
Cr-Commit-Position: refs/heads/master@{#343944}

[estevenson1, 2015-08-12 23:36:32]

estevenson@google.com changed reviewers:
+ jbudorick@chromium.org, mikecase@chromium.org

[mikecase (-- gone --), 2015-08-12 23:38:04]

non-owner lgtm

[jbudorick, 2015-08-18 15:18:41]

lgtm

[estevenson1, 2015-08-18 15:39:55]

The CQ bit was checked by estevenson@google.com

[estevenson1, 2015-08-18 15:39:55]

The patchset sent to the CQ was uploaded after l-g-t-m from
mikecase@chromium.org
Link to the patchset: https://codereview.chromium.org/1284083004/#ps40001
(title: "rebase")

[commit-bot: I haz the power, 2015-08-18 15:40:14]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1284083004/40001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1284083004/40001

[commit-bot: I haz the power, 2015-08-18 17:00:25]

Committed patchset #3 (id:40001)

[commit-bot: I haz the power, 2015-08-18 17:01:13]

Patchset 3 (id:??) landed as
https://crrev.com/39bc8c2a5c6a7b9b4f97d2b29359e151b9ccf402
Cr-Commit-Position: refs/heads/master@{#343944}