Add 4 more passing tests to CFI buildbot.

This CL has a moderate chance of breaking the CFI buildbot:
while I don't observe any CFI failures, browser_tests and
interactive_ui_tests are extremely flaky on my machine,
so I could miss some.

Should the buildbot be broken, I will quickly remove the
failing tests.

BUG=chromium:457523

Review URL: https://codereview.chromium.org/1272563003

Cr-Commit-Position: refs/heads/master@{#342372}

testing/buildbot/chromium.fyi.json

@@ -77,6 +77,12 @@
         },
         "test": "base_unittests"
       },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
+        "test": "browser_tests"
+      },
       {
         "swarming": {
           "can_use_on_swarming_builders": true
@@ -113,6 +119,18 @@
         },
         "test": "compositor_unittests"
       },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
+        "test": "content_browsertests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
+        "test": "content_unittests"
+      },
       {
         "swarming": {
           "can_use_on_swarming_builders": true
@@ -179,6 +197,12 @@
         },
         "test": "gpu_unittests"
       },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
+        "test": "interactive_ui_tests"
+      },
       {
         "test": "ipc_mojo_unittests"
       },