Warn hackers that ResourceType is reported in histograms.

Warn hackers that ResourceType is reported in histograms.

See https://chromiumcodereview.appspot.com/10701151 for our first
ResourceType histogram.

R=jamesr@chromium.org,frankwang@google.com
BUG=None


Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=150412

[gavinp, 2012-08-03 17:01:53]

WDYT?

[frankwang, 2012-08-03 17:06:12]

lgtm

[gavinp, 2012-08-07 15:34:35]

On 2012/08/03 17:06:12, frankwang wrote:
> lgtm

jamesr, wdyt?

[jamesr, 2012-08-07 19:22:02]

lgtm

[commit-bot: I haz the power, 2012-08-07 19:22:41]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/gavinp@chromium.org/10832138/1

[commit-bot: I haz the power, 2012-08-07 21:17:49]

Change committed as 150412