Sync performance tests: include datatype in trace label for performance graphs.

Sync performance tests: include datatype in trace label for performance graphs.

BUG=none
TEST=sync_performance_tests

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=96259

[Raghu Simha, 2011-08-10 19:46:44]

This LGTM as it is, but here's something to consider:

Do you want to group the results on the performance dashboard page by operation
or by datatype? Right now, you'll see all add times followed by all delete
times, etc. If you want to see the numbers grouped by datatype, you'll need to
prefix instead of postfix the datatype names.

[braffert, 2011-08-10 19:56:52]

On 2011/08/10 19:46:44, rsimha wrote:
> This LGTM as it is, but here's something to consider:
> 
> Do you want to group the results on the performance dashboard page by
operation
> or by datatype? Right now, you'll see all add times followed by all delete
> times, etc. If you want to see the numbers grouped by datatype, you'll need to
> prefix instead of postfix the datatype names.

I hadn't considered this, I used postfix simply because it seemed more natural. 
This would only affect the ordering within the block on the waterfall, so it
doesn't seem like anything to be concerned with.