Initial bot with instrumentation-test tracing.

Bug: 
Change-Id: I70fd0185bdf539a8e624bde60feb2df2ee1e02ed
Reviewed-on: https://chromium-review.googlesource.com/550870Reviewed-by: John Budorick <jbudorick@chromium.org>
Commit-Queue: Nick Ward <npward@google.com>
Cr-Commit-Position: refs/heads/master@{#488693}

testing/buildbot/chromium.android.fyi.json

@@ -21,6 +21,28 @@
       }
     ]
   },
+  "Android Tests with Tracing": {
+    "instrumentation_tests": [
+      {
+        "args": [
+          "--trace-all"
+        ],
+        "test": "chrome_public_test_apk"
+      },
+      {
+        "args": [
+          "--trace-all"
+        ],
+        "test": "chrome_sync_shell_test_apk"
+      },
+      {
+        "args": [
+          "--trace-all"
+        ],
+        "test": "content_shell_test_apk"
+      }
+    ]
+  },
   "Jelly Bean Tester": {
     "gtest_tests": [
       {