ChromeOS: Per-user time zone: refactor tests first.

chrome/browser/chromeos/file_manager/path_util_unittest.cc

Index: chrome/browser/chromeos/file_manager/path_util_unittest.cc
diff --git a/chrome/browser/chromeos/file_manager/path_util_unittest.cc b/chrome/browser/chromeos/file_manager/path_util_unittest.cc
index f7ad12162f5a8ee9a46959d87fc694221b4a1724..dd65977b9ac13e5a9cd99eb2599c4afe355ec8fa 100644
--- a/chrome/browser/chromeos/file_manager/path_util_unittest.cc
+++ b/chrome/browser/chromeos/file_manager/path_util_unittest.cc
@@ -5,6 +5,7 @@
 #include "chrome/browser/chromeos/file_manager/path_util.h"
 
 #include "base/files/file_path.h"
+#include "base/sys_info.h"
 #include "chrome/browser/chromeos/login/users/fake_chrome_user_manager.h"
 #include "chrome/browser/chromeos/login/users/scoped_user_manager_enabler.h"
 #include "chrome/browser/chromeos/profiles/profile_helper.h"
@@ -20,9 +21,29 @@ namespace file_manager {
 namespace util {
 namespace {
 
+const char kLsbRelease[] =
+    "CHROMEOS_RELEASE_NAME=Chrome OS\n"
+    "CHROMEOS_RELEASE_VERSION=1.2.3.4\n";
+
+// Sets a valid Chrome  OS version info so IsRunningOnChromeOS() returns true.

[stevenjb, 2017/05/25 21:20:24]

This is a bit subtle, can you explain a little why we need to do this, or
reference an issue?

[Alexander Alekseev, 2017/05/26 02:18:01]

Done. (See below.)

+class ScopedSetRunningOnChromeOS {
+ public:
+  ScopedSetRunningOnChromeOS(const std::string& lsb_release,
+                             const base::Time& lsb_release_time) {
+    base::SysInfo::SetChromeOSVersionInfoForTest(lsb_release, lsb_release_time);
+  }
+  ~ScopedSetRunningOnChromeOS() {
+    base::SysInfo::SetChromeOSVersionInfoForTest("", base::Time());
+  }
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(ScopedSetRunningOnChromeOS);
+};
+
 TEST(FileManagerPathUtilTest, MultiProfileDownloadsFolderMigration) {
   content::TestBrowserThreadBundle thread_bundle;
   TestingProfile profile;
+  ScopedSetRunningOnChromeOS fake_release(kLsbRelease, base::Time());
 
   // This looks like "/home/chronos/u-hash/Downloads" in the production
   // environment.