[code coverage] Add support for webkit layout tests.

R=stgao,liaoyuke,jbudorick

Change-Id: Ie573c6d137743c69f5fa869edd47adf86edb4265
Reviewed-on: https://chromium-review.googlesource.com/c/1338110Reviewed-by: Yuke Liao <liaoyuke@chromium.org>
Reviewed-by: Shuotao Gao <stgao@chromium.org>
Reviewed-by: John Budorick <jbudorick@chromium.org>
Commit-Queue: Roberto Carrillo <robertocn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#608642}

testing/buildbot/chromium.fyi.json

@@ -6693,6 +6693,21 @@
         },
         "test": "wtf_unittests"
       }
+    ],
+    "isolated_scripts": [
+      {
+        "args": [
+          "--num-retries=3"
+        ],
+        "isolate_coverage_data": true,
+        "isolate_name": "webkit_layout_tests_exparchive",
+        "name": "webkit_layout_tests",
+        "results_handler": "layout tests",
+        "swarming": {
+          "can_use_on_swarming_builders": true,
+          "shards": 12
+        }
+      }
     ]
   },
   "linux-tcmalloc-rel": {

testing/buildbot/test_suites.pyl

@@ -553,6 +553,20 @@
       },
     },
 
+    'chromium_code_coverage_isolated_scripts': {
+      'webkit_layout_tests': {
+        'args': [
+          '--num-retries=3',
+        ],
+        'isolate_name': 'webkit_layout_tests_exparchive',
+        'results_handler': 'layout tests',
+        'swarming': {
+          'shards': 12,
+         },
+      },
+    },
+
+
     'chromium_gtests': {
       'angle_unittests': {},
       'base_unittests': {},

testing/buildbot/tryserver.chromium.linux.json

@@ -679,6 +679,21 @@
         },
         "test": "wtf_unittests"
       }
+    ],
+    "isolated_scripts": [
+      {
+        "args": [
+          "--num-retries=3"
+        ],
+        "isolate_coverage_data": true,
+        "isolate_name": "webkit_layout_tests_exparchive",
+        "name": "webkit_layout_tests",
+        "results_handler": "layout tests",
+        "swarming": {
+          "can_use_on_swarming_builders": true,
+          "shards": 12
+        }
+      }
     ]
   }
 }

testing/buildbot/waterfalls.pyl

@@ -1505,6 +1505,7 @@
         ],
         'test_suites': {
           'gtest_tests': 'chromium_linux_coverage_gtests',
+          'isolated_scripts': 'chromium_code_coverage_isolated_scripts',
         }
       },
       'linux-tcmalloc-rel': {
@@ -3668,6 +3669,7 @@
         ],
         'test_suites': {
           'gtest_tests': 'chromium_linux_coverage_gtests',
+          'isolated_scripts': 'chromium_code_coverage_isolated_scripts',
         },
       },
     },