Assign exceptions to bot "linux-blink-heap-concurrent-marking-tsan-rel"

Blink concurrent marking tsan bot currently times-out on some tests.
Copying relevant exceptions from bot "Linux TSan Tests" to make sure
the bot has enough resources to finish the tests.

Bug: 986235
Change-Id: Id805c02f0b8bd0786194d9115b78269673e26bc8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2013054
Commit-Queue: Omer Katz <omerkatz@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#734075}

testing/buildbot/chromium.fyi.json

@@ -15751,7 +15751,8 @@
             {
               "os": "Ubuntu-16.04"
             }
-          ]
+          ],
+          "shards": 2
         },
         "test": "blink_unittests",
         "test_target": "//third_party/blink/renderer/controller:blink_unittests"
@@ -15885,7 +15886,8 @@
             {
               "os": "Ubuntu-16.04"
             }
-          ]
+          ],
+          "shards": 2
         },
         "test": "components_unittests",
         "test_target": "//components:components_unittests"
@@ -15905,7 +15907,7 @@
               "os": "Ubuntu-16.04"
             }
           ],
-          "shards": 6
+          "shards": 4
         },
         "test": "content_browsertests",
         "test_target": "//content/test:content_browsertests"
@@ -16247,7 +16249,8 @@
             {
               "os": "Ubuntu-16.04"
             }
-          ]
+          ],
+          "shards": 4
         },
         "test": "net_unittests",
         "test_target": "//net:net_unittests"

testing/buildbot/test_suite_exceptions.pyl

@@ -377,6 +377,11 @@
           'shards': 2,
         },
       },
+      'linux-blink-heap-concurrent-marking-tsan-rel': {
+        'swarming': {
+          'shards': 2,
+        },
+      },
     },
   },
   'content_browsertests': {
@@ -454,6 +459,11 @@
           'shards': 16,
         },
       },
+      'linux-blink-heap-concurrent-marking-tsan-rel': {
+        'swarming': {
+          'shards': 4,
+        },
+      },
       'linux-chromeos-code-coverage': {
         'swarming': {
           'shards': 12,
@@ -1015,6 +1025,11 @@
           '--gtest_filter=-NetworkQualityEstimatorTest.TestTCPSocketRTT',
         ],
       },
+      'linux-blink-heap-concurrent-marking-tsan-rel': {
+        'swarming': {
+          'shards': 4,
+        }
+      },
       'linux-chromeos-dbg': {
         'swarming': {
           'shards': 2,
@@ -2086,6 +2101,11 @@
           'hard_timeout': 1200,
         },
       },
+      'linux-blink-heap-concurrent-marking-tsan-rel': {
+        'swarming': {
+          'shards': 2,
+        },
+      },
     },
   },
   'weblayer_browsertests': {