buildbot: Use multiple shards on Win Random Order bot.

testing/buildbot/chromium.fyi.json

Index: testing/buildbot/chromium.fyi.json
diff --git a/testing/buildbot/chromium.fyi.json b/testing/buildbot/chromium.fyi.json
index c2717d8b6103f140a93d9fbaba916b9453b6bcdb..a52c8becb420ac7abbc97ccc5b6f45697a59dc3a 100644
--- a/testing/buildbot/chromium.fyi.json
+++ b/testing/buildbot/chromium.fyi.json
@@ -12938,6 +12938,21 @@
     "isolated_scripts": [
       {
         "isolate_name": "webkit_layout_tests_exparchive",
+        "merge": {
+          "args": [
+            "--verbose",
+            "--results-json-override-with-build-property",
+            "build_number",
+            "buildnumber",
+            "--results-json-override-with-build-property",
+            "builder_name",
+            "buildername",
+            "--results-json-override-with-build-property",
+            "chromium_revision",
+            "got_revision_cp"
+          ],
+          "script": "//third_party/WebKit/Tools/Scripts/merge-layout-test-results"
+        },
         "name": "webkit_layout_tests",
         "swarming": {
           "can_use_on_swarming_builders": true,
@@ -12949,7 +12964,8 @@
               "os": "Windows-7-SP1"
             }
           ],
-          "shards": 1
+          "hard_timeout": 900,
+          "shards": 10
         }
       }
     ]