Update the tcmalloc vendor branch to r144 (gperftools 2.0), and README.chromium.

Update the tcmalloc vendor branch to r144 (gperftools 2.0), and README.chromium.

It's a retry of r126715 with updating README.chromium.

The major reason for us to enable a fix for HEAP_PROFILE_MMAP.
Please note that this change doesn't affect Chromium builds.

BUG=114302
TEST=none

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=126770

[Dai Mikurube (NOT FULLTIME), 2012-03-14 22:05:02]

Scott,

The version with non-executable here.


Jim,

Could you take a look at it?  The previous vendor branch update is reverted
since they had executable bits.

These contents are completely same with http://codereview.chromium.org/9316021/
except for README.chromium.  I updated README.chromium for version updates and
added some description about executable bits.

[scottmg, 2012-03-14 22:24:53]

On 2012/03/14 22:05:02, Dai Mikurube wrote:
> Scott,
> 
> The version with non-executable here.

lgtm

> 
> Jim,
> 
> Could you take a look at it?  The previous vendor branch update is reverted
> since they had executable bits.
> 
> These contents are completely same with
http://codereview.chromium.org/9316021/
> except for README.chromium.  I updated README.chromium for version updates and
> added some description about executable bits.