[Benchmarking] Updated the dimension to ensure homogeneous fleets: Linux

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 linux-perf:
 - Added synthetic product name 'PowerEdge R230 (Dell Inc.)';
 - Updated GPU from '10de:1cb3' to '10de:1cb3-384.90';
 - Updated OS from 'Ubuntu' to 'Ubuntu-14.04'

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=status&c=synthetic_product_name&d=asc&f=gpu%3A10de%3A1cb3&f=os%3AUbuntu&f=cpu%3Ax86-64&f=pool%3Achrome.tests.perf&s=id

Bug: chromium:996830
Change-Id: I0eaaea53448d3044b6f10f9020c8f4c1a27318eb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1888193Reviewed-by: Caleb Rouleau <crouleau@chromium.org>
Commit-Queue: Wenbin Zhang <wenbinzhang@google.com>
Cr-Commit-Position: refs/heads/master@{#710569}

testing/buildbot/chromium.perf.json

@@ -1526,9 +1526,10 @@
           "can_use_on_swarming_builders": true,
           "dimension_sets": [
             {
-              "gpu": "10de:1cb3",
-              "os": "Ubuntu",
-              "pool": "chrome.tests.perf"
+              "gpu": "10de:1cb3-384.90",
+              "os": "Ubuntu-14.04",
+              "pool": "chrome.tests.perf",
+              "synthetic_product_name": "PowerEdge R230 (Dell Inc.)"
             }
           ],
           "expiration": 7200,
@@ -1563,9 +1564,10 @@
           "can_use_on_swarming_builders": true,
           "dimension_sets": [
             {
-              "gpu": "10de:1cb3",
-              "os": "Ubuntu",
-              "pool": "chrome.tests.perf"
+              "gpu": "10de:1cb3-384.90",
+              "os": "Ubuntu-14.04",
+              "pool": "chrome.tests.perf",
+              "synthetic_product_name": "PowerEdge R230 (Dell Inc.)"
             }
           ],
           "expiration": 7200,
@@ -1600,9 +1602,10 @@
           "can_use_on_swarming_builders": true,
           "dimension_sets": [
             {
-              "gpu": "10de:1cb3",
-              "os": "Ubuntu",
-              "pool": "chrome.tests.perf"
+              "gpu": "10de:1cb3-384.90",
+              "os": "Ubuntu-14.04",
+              "pool": "chrome.tests.perf",
+              "synthetic_product_name": "PowerEdge R230 (Dell Inc.)"
             }
           ],
           "expiration": 7200,
@@ -1637,9 +1640,10 @@
           "can_use_on_swarming_builders": true,
           "dimension_sets": [
             {
-              "gpu": "10de:1cb3",
-              "os": "Ubuntu",
-              "pool": "chrome.tests.perf"
+              "gpu": "10de:1cb3-384.90",
+              "os": "Ubuntu-14.04",
+              "pool": "chrome.tests.perf",
+              "synthetic_product_name": "PowerEdge R230 (Dell Inc.)"
             }
           ],
           "expiration": 7200,
@@ -1674,9 +1678,10 @@
           "can_use_on_swarming_builders": true,
           "dimension_sets": [
             {
-              "gpu": "10de:1cb3",
-              "os": "Ubuntu",
-              "pool": "chrome.tests.perf"
+              "gpu": "10de:1cb3-384.90",
+              "os": "Ubuntu-14.04",
+              "pool": "chrome.tests.perf",
+              "synthetic_product_name": "PowerEdge R230 (Dell Inc.)"
             }
           ],
           "expiration": 7200,
@@ -1711,9 +1716,10 @@
           "can_use_on_swarming_builders": true,
           "dimension_sets": [
             {
-              "gpu": "10de:1cb3",
-              "os": "Ubuntu",
-              "pool": "chrome.tests.perf"
+              "gpu": "10de:1cb3-384.90",
+              "os": "Ubuntu-14.04",
+              "pool": "chrome.tests.perf",
+              "synthetic_product_name": "PowerEdge R230 (Dell Inc.)"
             }
           ],
           "expiration": 7200,
@@ -1752,9 +1758,10 @@
           "can_use_on_swarming_builders": true,
           "dimension_sets": [
             {
-              "gpu": "10de:1cb3",
-              "os": "Ubuntu",
-              "pool": "chrome.tests.perf"
+              "gpu": "10de:1cb3-384.90",
+              "os": "Ubuntu-14.04",
+              "pool": "chrome.tests.perf",
+              "synthetic_product_name": "PowerEdge R230 (Dell Inc.)"
             }
           ],
           "expiration": 7200,

tools/perf/core/perf_data_generator.py

@@ -768,9 +768,10 @@ BUILDERS = {
     ],
     'platform': 'linux',
     'dimension': {
-      'gpu': '10de:1cb3',
-      'os': 'Ubuntu',
+      'gpu': '10de:1cb3-384.90',
+      'os': 'Ubuntu-14.04',
       'pool': 'chrome.tests.perf',
+      'synthetic_product_name': 'PowerEdge R230 (Dell Inc.)'
     },
   },
   'mac-10_13_laptop_high_end-perf': {