Rotate frames correctly for back camera

media/capture/video/linux/camera_facing_chromeos_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 <string>
+
+#include "media/capture/video/linux/camera_facing_chromeos.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace media {
+
+TEST(CameraFacingChromeOSTest, ParseSuccessfully) {
+  CameraFacingChromeOS camera_facing(
+      std::string("fake_camera_characteristics.conf"));

[mcasas, 2016/12/05 18:23:19]

I don't think you can access files from unittests, but might
need to create it yourself like in e.g. [1].

[1]
https://cs.chromium.org/chromium/src/base/files/file_unittest.cc?q=unittest+b...

[shenghao, 2016/12/06 10:51:28]

Done.

+  EXPECT_EQ(CameraFacingChromeOS::LensFacing::BACK,
+            camera_facing.GetCameraFacing(std::string("/dev/video2"),
+                                          std::string("04f2:b53a")));
+}
+
+TEST(CameraFacingChromeOSTest, ConfigFileNotExist) {
+  CameraFacingChromeOS camera_facing(std::string("file_not_exist"));
+  EXPECT_EQ(CameraFacingChromeOS::LensFacing::FRONT,
+            camera_facing.GetCameraFacing(std::string("/dev/video2"),
+                                          std::string("04f2:b53a")));
+}
+
+}  // namespace media