arc: Add arc.BootForever test.

This test repeatedly boots ARC (almost) forever. It is supposed to
be used to reproduce ARC boot flakiness issues, so it is disabled
by default.

BUG=chromium:865213
TEST=tast -verboser run DUT arc.BootForever

Change-Id: I37a2b2388fda399693740d62c875138daced1f94
Reviewed-on: https://chromium-review.googlesource.com/1143118
Commit-Ready: Shuhei Takahashi <nya@chromium.org>
Tested-by: Shuhei Takahashi <nya@chromium.org>
Reviewed-by: Shuhei Takahashi <nya@chromium.org>

src/chromiumos/tast/local/bundles/cros/arc/boot_forever.go

diff --git a/src/chromiumos/tast/local/bundles/cros/arc/boot_forever.go b/src/chromiumos/tast/local/bundles/cros/arc/boot_forever.go
new file mode 100644
index 0000000..529c56eb
--- /dev/null
+++ b/src/chromiumos/tast/local/bundles/cros/arc/boot_forever.go
@@ -0,0 +1,50 @@
+// Copyright 2018 The Chromium OS Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package arc
+
+import (
+	"context"
+	"time"
+
+	"chromiumos/tast/local/arc"
+	"chromiumos/tast/local/chrome"
+	"chromiumos/tast/testing"
+)
+
+func init() {
+	testing.AddTest(&testing.Test{
+		Func:         BootForever,
+		Desc:         "Checks that Android boots repeatedly",
+		Attr:         []string{"disabled"},
+		SoftwareDeps: []string{"android", "chrome_login"},
+		Timeout:      365 * 24 * time.Hour,
+	})
+}
+
+func BootForever(s *testing.State) {
+	iter := func() {
+		ctx, cancel := context.WithTimeout(s.Context(), 2*time.Minute)
+		defer cancel()
+
+		cr, err := chrome.New(ctx)
+		if err != nil {
+			s.Fatal("Failed to connect to Chrome: ", err)
+		}
+		defer cr.Close(ctx)
+
+		a, err := arc.New(ctx, cr, s.OutDir())
+		if err != nil {
+			s.Fatal("Failed to start ARC: ", err)
+		}
+		defer a.Close()
+
+		// Skip further sanity checks to speed up iterations.
+	}
+
+	for i := 0; ; i++ {
+		s.Log("======= Iteration ", i+1)
+		iter()
+	}
+}