Add GetTimeTicksNow() to PlatformSupport.

Add GetTimeTicksNow() to PlatformSupport.

And convert some uses of base::TimeTicks (in particular,
base::TimeTicks::Now()).

Still to do: Convert the use in Waiter (which will require some
injection).

R=kulakowski@chromium.org

Committed: https://chromium.googlesource.com/external/mojo/+/81937c3f013dd09b3930949841e611964c5ceb3d

[kulakowski, 2015-09-14 21:44:28]

lgtm assuming the BUILD.gn stuff is sensible (I'm not familiar with the build
rules involved).

https://codereview.chromium.org/1345583002/diff/20001/mojo/edk/embedder/platf...
File mojo/edk/embedder/platform_support.h (right):

https://codereview.chromium.org/1345583002/diff/20001/mojo/edk/embedder/platf...
mojo/edk/embedder/platform_support.h:28: //   - The value should be (weakly)
monotonic with respect to time.
Weakly as in <= vs <, or weakly as in only true statistically or in the long
run?

[viettrungluu, 2015-09-14 21:56:23]

Thanks.

On 2015/09/14 21:44:28, kulakowski wrote:
> lgtm assuming the BUILD.gn stuff is sensible (I'm not familiar with the build
> rules involved).

It's sensible-ish. I'll do some other clean-up separately.

> 
>
https://codereview.chromium.org/1345583002/diff/20001/mojo/edk/embedder/platf...
> File mojo/edk/embedder/platform_support.h (right):
> 
>
https://codereview.chromium.org/1345583002/diff/20001/mojo/edk/embedder/platf...
> mojo/edk/embedder/platform_support.h:28: //   - The value should be (weakly)
> monotonic with respect to time.
> Weakly as in <= vs <, or weakly as in only true statistically or in the long
> run?

The former. I guess I'll clarify.

[viettrungluu, 2015-09-14 22:02:25]

Committed patchset #3 (id:40001) manually as
81937c3f013dd09b3930949841e611964c5ceb3d (presubmit successful).