Revert "[fuchsia] Temporarily remove blink_web_tests from Fuchsia x64 bot."

This reverts commit 536cecb4.

Reason for revert: Landed https://chromium-review.googlesource.com/c/chromium/src/+/2258294 to skip failing tests, which may resolve the flakiness.

Original change's description:
> [fuchsia] Temporarily remove blink_web_tests from Fuchsia x64 bot.
> 
> blink_web_tests are now failing 50-70% on the waterfall, so disable them
> until the cause of flakes has been properly resolved.
> 
> TBR=sergeyu,chonggu,dpranke
> 
> Bug: 1096611
> Change-Id: I5f7f9889a516bbc51eec23c63dca6d43c06d490c
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2257182
> Reviewed-by: Dirk Pranke <dpranke@google.com>
> Reviewed-by: Wez <wez@chromium.org>
> Commit-Queue: Wez <wez@chromium.org>
> Auto-Submit: Wez <wez@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#780993}

TBR=wez@chromium.org,dpranke@google.com,sergeyu@chromium.org,chonggu@google.com

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 1096611
Change-Id: Idcc48e6dedca8551b07c2350ede2a6f40663b506
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2267845Reviewed-by: Sergey Ulanov <sergeyu@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@google.com>
Commit-Queue: Sergey Ulanov <sergeyu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#784188}

testing/buildbot/chromium.ci.json

@@ -28416,6 +28416,33 @@
       }
     ],
     "isolated_scripts": [
+      {
+        "args": [
+          "--num-retries=3",
+          "--device=aemu",
+          "--platform=fuchsia"
+        ],
+        "isolate_name": "blink_web_tests",
+        "merge": {
+          "args": [
+            "--verbose"
+          ],
+          "script": "//third_party/blink/tools/merge_web_test_results.py"
+        },
+        "name": "blink_web_tests",
+        "results_handler": "layout tests",
+        "swarming": {
+          "can_use_on_swarming_builders": true,
+          "dimension_sets": [
+            {
+              "kvm": "1",
+              "os": "Ubuntu-16.04"
+            }
+          ],
+          "service_account": "chromium-tester@chops-service-accounts.iam.gserviceaccount.com"
+        },
+        "test_id_prefix": "ninja://:blink_web_tests/"
+      },
       {
         "args": [
           "depth_capture",

testing/buildbot/chromium.linux.json

@@ -4033,6 +4033,33 @@
       }
     ],
     "isolated_scripts": [
+      {
+        "args": [
+          "--num-retries=3",
+          "--device=aemu",
+          "--platform=fuchsia"
+        ],
+        "isolate_name": "blink_web_tests",
+        "merge": {
+          "args": [
+            "--verbose"
+          ],
+          "script": "//third_party/blink/tools/merge_web_test_results.py"
+        },
+        "name": "blink_web_tests",
+        "results_handler": "layout tests",
+        "swarming": {
+          "can_use_on_swarming_builders": true,
+          "dimension_sets": [
+            {
+              "kvm": "1",
+              "os": "Ubuntu-16.04"
+            }
+          ],
+          "service_account": "chromium-tester@chops-service-accounts.iam.gserviceaccount.com"
+        },
+        "test_id_prefix": "ninja://:blink_web_tests/"
+      },
       {
         "args": [
           "depth_capture",

testing/buildbot/waterfalls.pyl

@@ -4085,8 +4085,7 @@
         },
         'test_suites': {
           'gtest_tests': 'fuchsia_gtests',
-	  # TODO(https://crbug.com/1096611): Re-enable once flakes are resolved.
-          #'isolated_scripts': 'chromium_webkit_isolated_scripts',
+          'isolated_scripts': 'chromium_webkit_isolated_scripts',
           'gpu_telemetry_tests': 'fuchsia_gpu_telemetry_tests',
         },
       },