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In order to ensure homogeneous fleets, we need to have more specific
dimension values when looking for bots. This set of CLs updated some
existing dimensions, and added the synthetic_product_name values for
dimensions if appropriate.

This CL updated the dimensions for Win 7 Perf:
 - Added synthetic product name 'PowerEdge R210 II (Dell Inc.)';
 - Updated GPU from '102b:0532' to '102b:0532-6.1.7600.16385'.

Please check the link below for the available bots based on the
old/new dimensions:
https://chrome-swarming.appspot.com/botlist?c=id&c=task&c=gpu&c=os&c=pool&c=status&c=synthetic_product_name&d=desc&f=gpu%3A102b%3A0532&f=os%3AWindows-2008ServerR2-SP1&f=cpu%3Ax86-64&f=pool%3Achrome.tests.perf&s=synthetic_product_name

Bug: chromium:996830
Change-Id: I1fc8278887a8e362958205f1cccde11f1f129030
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1867473Reviewed-by: Caleb Rouleau <crouleau@chromium.org>
Commit-Queue: Wenbin Zhang <wenbinzhang@google.com>
Cr-Commit-Position: refs/heads/master@{#707268}