tools/battor_agent: Adds a tool to find connected BattOrs

tools/battor_agent/battor_finder.cc

Index: tools/battor_agent/battor_finder.cc
diff --git a/tools/battor_agent/battor_finder.cc b/tools/battor_agent/battor_finder.cc
new file mode 100644
index 0000000000000000000000000000000000000000..b0e32db1ee9b0f27dec6f912befd1d157f0ec583
--- /dev/null
+++ b/tools/battor_agent/battor_finder.cc
@@ -0,0 +1,39 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "tools/battor_agent/battor_finder.h"
+
+#include "device/serial/serial.mojom.h"
+#include "device/serial/serial_device_enumerator.h"
+#include "mojo/public/cpp/bindings/array.h"
+
+namespace battor {
+
+namespace {
+
+// The USB display name prefix that all BattOrs have.
+const char kBattOrDisplayNamePrefix[] = "BattOr";
+
+}  // namespace
+
+// Returns the path of the first BattOr that we find.
+std::string BattOrFinder::FindBattOr() {
+  scoped_ptr<device::SerialDeviceEnumerator> serial_device_enumerator =
+      device::SerialDeviceEnumerator::Create();
+
+  mojo::Array<device::serial::DeviceInfoPtr> devices =
+      serial_device_enumerator->GetDevices();
+
+  for (size_t i = 0; i < devices.size(); i++) {
+    std::string display_name = devices[i]->display_name.get();
+
+    if (display_name.find(kBattOrDisplayNamePrefix) != std::string::npos) {
+      return devices[i]->path;
+    }
+  }
+
+  return std::string();
+}
+
+}  // namespace battor