Add alternate swarming dimensions for Linux NV GPU bot.

This will allow us to complete the driver upgrade. It does not use
the optional swarming mixin feature. A prior attempt to use the
optional mixin failed due to a bug. After the upgrade is complete
we will need to quickly remove the alternate swarming dimensions.

Bug: 887241
Change-Id: Ib2bdbe3587a61597287285047c7dfdd7f19fdad1
Reviewed-on: https://chromium-review.googlesource.com/c/1447841Reviewed-by: Kenneth Russell <kbr@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Cr-Commit-Position: refs/heads/master@{#628022}

testing/buildbot/waterfalls.pyl

@@ -1799,6 +1799,14 @@
           'gtest_tests': 'gpu_desktop_gtests',
           'gpu_telemetry_tests': 'gpu_common_win_and_linux_telemetry_tests',
         },
+        'use_multi_dimension_trigger_script': True,
+        'alternate_swarming_dimensions': [
+          {
+            'gpu': '10de:1cb3-410.78',
+            'os': 'Ubuntu',
+            'pool': 'Chrome-GPU',
+          },
+        ],
       },
       'Linux Release (NVIDIA)': {
         'browser_config': 'release',
@@ -1810,6 +1818,14 @@
           'gtest_tests': 'gpu_desktop_gtests',
           'gpu_telemetry_tests': 'gpu_common_win_and_linux_telemetry_tests',
         },
+        'use_multi_dimension_trigger_script': True,
+        'alternate_swarming_dimensions': [
+          {
+            'gpu': '10de:1cb3-410.78',
+            'os': 'Ubuntu',
+            'pool': 'Chrome-GPU',
+          },
+        ],
       },
       'Mac Debug (Intel)': {
         'browser_config': 'debug',
@@ -2182,6 +2198,14 @@
         'test_suites': {
           'gtest_tests': 'gpu_dawn_end2end_tests',
         },
+        'use_multi_dimension_trigger_script': True,
+        'alternate_swarming_dimensions': [
+          {
+            'gpu': '10de:1cb3-410.78',
+            'os': 'Ubuntu',
+            'pool': 'Chrome-GPU',
+          },
+        ],
       },
       'Dawn GPU Mac Release (Intel)': {
         'os_type': 'mac',
@@ -2257,6 +2281,14 @@
           'gtest_tests': 'gpu_fyi_linux_debug_gtests',
           'gpu_telemetry_tests': 'gpu_fyi_win_and_linux_telemetry_tests',
         },
+        'use_multi_dimension_trigger_script': True,
+        'alternate_swarming_dimensions': [
+          {
+            'gpu': '10de:1cb3-410.78',
+            'os': 'Ubuntu',
+            'pool': 'Chrome-GPU',
+          },
+        ],
       },
       'Linux FYI Experimental Release (Intel HD 630)': {
         'os_type': 'linux',
@@ -2294,6 +2326,14 @@
           'gtest_tests': 'gpu_fyi_linux_debug_gtests',
           'isolated_scripts': 'gpu_angle_perftests',
         },
+        'use_multi_dimension_trigger_script': True,
+        'alternate_swarming_dimensions': [
+          {
+            'gpu': '10de:1cb3-410.78',
+            'os': 'Ubuntu',
+            'pool': 'Chrome-GPU',
+          },
+        ],
       },
       'Linux FYI Ozone (Intel)': {
         'os_type': 'linux',
@@ -2343,6 +2383,14 @@
           'isolated_scripts': 'gpu_angle_perftests',
           'gpu_telemetry_tests': 'gpu_fyi_linux_intel_and_nvidia_release_telemetry_tests',
         },
+        'use_multi_dimension_trigger_script': True,
+        'alternate_swarming_dimensions': [
+          {
+            'gpu': '10de:1cb3-410.78',
+            'os': 'Ubuntu',
+            'pool': 'Chrome-GPU',
+          },
+        ],
       },
       'Linux FYI dEQP Release (Intel HD 630)': {
         'os_type': 'linux',
@@ -2363,6 +2411,14 @@
         'test_suites': {
           'gtest_tests': 'gpu_angle_deqp_linux_nvidia_gtests',
         },
+        'use_multi_dimension_trigger_script': True,
+        'alternate_swarming_dimensions': [
+          {
+            'gpu': '10de:1cb3-410.78',
+            'os': 'Ubuntu',
+            'pool': 'Chrome-GPU',
+          },
+        ],
       },
       'Mac FYI 10.14 Release (AMD)': {
         'os_type': 'mac',
@@ -2600,6 +2656,14 @@
           'isolated_scripts': 'gpu_angle_perftests',
           'gpu_telemetry_tests': 'gpu_fyi_optional_linux_telemetry_tests',
         },
+        'use_multi_dimension_trigger_script': True,
+        'alternate_swarming_dimensions': [
+          {
+            'gpu': '10de:1cb3-410.78',
+            'os': 'Ubuntu',
+            'pool': 'Chrome-GPU',
+          },
+        ],
       },
       'Optional Mac Release (Intel)': {
         'os_type': 'mac',
@@ -3678,6 +3742,14 @@
         'test_suites': {
           'gpu_telemetry_tests': 'gpu_v8_desktop_telemetry_tests',
         },
+        'use_multi_dimension_trigger_script': True,
+        'alternate_swarming_dimensions': [
+          {
+            'gpu': '10de:1cb3-410.78',
+            'os': 'Ubuntu',
+            'pool': 'Chrome-GPU',
+          },
+        ],
       },
       'Linux V8 FYI Release - pointer compression (NVIDIA)': {
         'os_type': 'linux',
@@ -3688,6 +3760,14 @@
         'test_suites': {
           'gpu_telemetry_tests': 'gpu_v8_desktop_telemetry_tests',
         },
+        'use_multi_dimension_trigger_script': True,
+        'alternate_swarming_dimensions': [
+          {
+            'gpu': '10de:1cb3-410.78',
+            'os': 'Ubuntu',
+            'pool': 'Chrome-GPU',
+          },
+        ],
       },
       'Mac V8 FYI Release (Intel)': {
         'browser_config': 'release',