Add signal strength indicator icon to WebBluetooth chooser on non-Mac desktops

content/browser/bluetooth/bluetooth_device_chooser_controller_unittest.cc

+// 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 "content/browser/bluetooth/bluetooth_device_chooser_controller.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace content {
+
+class BluetoothDeviceChooserControllerTest : public testing::Test {};
+
+TEST_F(BluetoothDeviceChooserControllerTest, CalculateSignalStrengthLevel) {
+  EXPECT_EQ(
+      0, BluetoothDeviceChooserController::CalculateSignalStrengthLevel(-128));
+  EXPECT_EQ(
+      0, BluetoothDeviceChooserController::CalculateSignalStrengthLevel(-100));
+  EXPECT_EQ(
+      0, BluetoothDeviceChooserController::CalculateSignalStrengthLevel(-89));
+  EXPECT_EQ(
+      1, BluetoothDeviceChooserController::CalculateSignalStrengthLevel(-88));
+  EXPECT_EQ(
+      1, BluetoothDeviceChooserController::CalculateSignalStrengthLevel(-78));
+  EXPECT_EQ(
+      2, BluetoothDeviceChooserController::CalculateSignalStrengthLevel(-77));
+  EXPECT_EQ(
+      2, BluetoothDeviceChooserController::CalculateSignalStrengthLevel(-67));
+  EXPECT_EQ(
+      3, BluetoothDeviceChooserController::CalculateSignalStrengthLevel(-66));
+  EXPECT_EQ(
+      3, BluetoothDeviceChooserController::CalculateSignalStrengthLevel(-56));
+  EXPECT_EQ(
+      4, BluetoothDeviceChooserController::CalculateSignalStrengthLevel(-55));
+  EXPECT_EQ(
+      4, BluetoothDeviceChooserController::CalculateSignalStrengthLevel(127));
+}
+
+}  // namespace content