lut_inverse_interp16: interpolate degenerate zeros in TRC curves

lut_inverse_interp16: interpolate degenerate zeros in TRC curves

Degenerate TRC have runs of 0's / 1's from the left / right edge of
the TRC curve (a curve we want to invert, to be able to use a color
profile as a monitor profile). The inverse TRC of degenerate curves
is not well-defined in the run of 0's area (infinite slope).

Some monitor calibration software in the field produce 0 runs, thus
degenerate TRC, and QCMS setting the inverse of the run to 0's area
to 0 causes a color cast (burn) effect on web images corrected with
the associated color profile: issue 492379.

Fix that by interpolating the (imaginary) inverse in the 0 run area
instead of clamping the inverse to 0. Add more assert conditions to
the curve inversion algorithm and also check for an inverted binary
search range (these two changes from the related Mozilla bug).

CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel,mac_blink_rel,win_blink_rel
BUG=458024
Committed: https://crrev.com/9c5cf06617232b00842383ff001c49fe058fc6b4
Cr-Commit-Position: refs/heads/master@{#334996}

[Noel Gordon, 2015-06-16 15:50:15]

The CQ bit was checked by noel@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2015-06-16 15:50:42]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1185163003/1

[commit-bot: I haz the power, 2015-06-16 17:05:28]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-06-16 17:05:29]

Dry run: This issue passed the CQ dry run.

[Noel Gordon, 2015-06-17 04:59:41]

noel@chromium.org changed reviewers:
+ kbr@chromium.org, mikelawther@chromium.org

[Mike Lawther (Google), 2015-06-17 17:08:46]

On 2015/06/17 04:59:41, noel gordon wrote:

I can't access https://bugzil.la/1132467 (permission denied), but if this is
what Mozilla is doing and this gives us compat with them, then sounds good.

lgtm

[Ken Russell (switch to Gerrit), 2015-06-17 17:12:38]

lgtm too.

[Noel Gordon, 2015-06-18 03:25:03]

The CQ bit was checked by noel@chromium.org

[commit-bot: I haz the power, 2015-06-18 03:26:12]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1185163003/1

[commit-bot: I haz the power, 2015-06-18 05:35:04]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-06-18 05:35:47]

Patchset 1 (id:??) landed as
https://crrev.com/9c5cf06617232b00842383ff001c49fe058fc6b4
Cr-Commit-Position: refs/heads/master@{#334996}