When we can expect chromium 42 for precious 12.04 armhf

I suggest you report a bug. It may get the package updated faster

There may also be a PPA with the newer version, here on Launchpad

There are some problems preparing updated versions of chromium-browser for Ubuntu precise.
see https://bugs.launchpad.net/ubuntu/+source/chromium-browser/+bug/1468666
https://answers.launchpad.net/ubuntu/+source/chromium-browser/+question/263114

I see that there is a 43.* version for armhf on precise in https://launchpad.net/~canonical-chromium-builds/+archive/ubuntu/stage but I do not know whether it works.

I tried that PPA chromium 43*. That also crashing in webrtc.
I need webrtc very badly in my armhf platform.any direction towards that will greatly appreciated.

Do you see a chance to upgrade your system from Ubuntu precise to trusty?
Chromium 43.* has been delivered for trusty in the standard Ubuntu repositories.
(I, however, do not know whether that delivers the desired webrtc functionality.)

I am using udoo (udoo.org) and that runs on precise 12.04.
That's why is upgrade is my last choice. Please let me know by any means we can expidete the chromium release for precise?

Did webrtc work well in one of the older versions of the chromium browser?
If you need that functionality so badly, then you might revert to that older version (for the costs of some other bugs).

The options that I see:
1. Look for a working version on standard Ubuntu repositories, PPAs, and other sources (e.g. Google pages)
2. Try building a working version yourself (either locally or in a PPA of your own)
3. Try contacting the Ubuntu developers and ask them directly (not via the launchpad question area, but via launchpad bug pages or the launchpad group pages or launchpad personal pages of the developers).