Added XMLExternalResourceLoaded to WebCore.FeatureObserver in histograms.xml.

Added XMLExternalResourceLoaded to WebCore.FeatureObserver in histograms.xml.

To deprecate loading external resources in XML, e.g. external DTDs, measure its usage.

BUG=

Committed: https://crrev.com/336ca4d58481f5545910325187b273120b0247e1
Cr-Commit-Position: refs/heads/master@{#294402}

[tasak, 2014-09-10 09:37:27]

tasak@google.com changed reviewers:
+ asvitkine@chromium.org, isherman@chromium.org

[tasak, 2014-09-10 09:37:28]

Would you review this CL?

I have already updated third_party/WebKit/Source/core/frame/UseCounter.h:

https://codereview.chromium.org/552673002/
https://src.chromium.org/viewvc/blink?view=rev&revision=181602

[Alexei Svitkine (slow), 2014-09-10 13:41:00]

https://codereview.chromium.org/553233006/diff/1/tools/metrics/histograms/his...
File tools/metrics/histograms/histograms.xml (left):

https://codereview.chromium.org/553233006/diff/1/tools/metrics/histograms/his...
tools/metrics/histograms/histograms.xml:42305: <int value="524"
label="SrcsetWDescriptor"/>
Would you mind also adding the entries after this one but before yours to the
XML file?

[tasak, 2014-09-11 05:49:51]

Thank you for reviewing.

https://codereview.chromium.org/553233006/diff/1/tools/metrics/histograms/his...
File tools/metrics/histograms/histograms.xml (left):

https://codereview.chromium.org/553233006/diff/1/tools/metrics/histograms/his...
tools/metrics/histograms/histograms.xml:42305: <int value="524"
label="SrcsetWDescriptor"/>
On 2014/09/10 13:41:00, Alexei Svitkine wrote:
> Would you mind also adding the entries after this one but before yours to the
> XML file?

Sure. Done.

[Alexei Svitkine (slow), 2014-09-11 15:35:31]

The CQ bit was checked by asvitkine@chromium.org

[Alexei Svitkine (slow), 2014-09-11 15:35:31]

lgtm

[commit-bot: I haz the power, 2014-09-11 15:37:52]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patchset/553233006/20001

[commit-bot: I haz the power, 2014-09-11 16:41:17]

Committed patchset #2 (id:20001) as a3fd4c43df93532c24240b4c84f16b9c4c3571ad

[commit-bot: I haz the power, 2014-09-11 16:47:50]

Patchset 2 (id:??) landed as
https://crrev.com/336ca4d58481f5545910325187b273120b0247e1
Cr-Commit-Position: refs/heads/master@{#294402}