[Night Light] CL4: Automatic schedule backend.

ash/system/night_light/night_light_time.cc

Index: ash/system/night_light/night_light_time.cc
diff --git a/ash/system/night_light/night_light_time.cc b/ash/system/night_light/night_light_time.cc
new file mode 100644
index 0000000000000000000000000000000000000000..6c61c72a94717e62bf4ba11f5ac207d1c002c026
--- /dev/null
+++ b/ash/system/night_light/night_light_time.cc
@@ -0,0 +1,60 @@
+// Copyright 2017 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 "ash/system/night_light/night_light_time.h"
+#include <base/i18n/time_formatting.h>

[James Cook, 2017/05/23 16:34:59]

nit: blank line above, and no <>

[afakhry, 2017/05/24 04:21:10]

Done.

+#include <base/strings/utf_string_conversions.h>

[James Cook, 2017/05/23 16:34:59]

no <>

[afakhry, 2017/05/24 04:21:10]

Done.

+
+namespace ash {
+
+namespace {
+
+constexpr int kMaxOffsetMinutes = 24 * 60;
+
+}  // namespace
+
+NightLightTime::NightLightTime(int offset_minutes)
+    : offset_minutes_from_zero_hour_(
+          offset_minutes == kMaxOffsetMinutes ? 0 : offset_minutes) {
+  DCHECK_LE(offset_minutes_from_zero_hour_, kMaxOffsetMinutes);
+}
+
+NightLightTime::NightLightTime(const NightLightTime& other)
+    : offset_minutes_from_zero_hour_(other.offset_minutes_from_zero_hour_) {}
+
+// static
+NightLightTime NightLightTime::FromTime(const base::Time& time) {
+  base::Time::Exploded exploded;
+  time.LocalExplode(&exploded);
+  return NightLightTime(exploded.hour * 60 + exploded.minute);
+}
+
+NightLightTime& NightLightTime::operator=(const NightLightTime& rhs) {
+  if (this != &rhs)
+    offset_minutes_from_zero_hour_ = rhs.offset_minutes_from_zero_hour_;
+
+  return *this;
+}
+
+bool NightLightTime::operator==(const NightLightTime& rhs) const {
+  return offset_minutes_from_zero_hour_ == rhs.offset_minutes_from_zero_hour_;
+}
+
+base::Time NightLightTime::ToTime() const {
+  base::Time::Exploded now;
+  base::Time::Now().LocalExplode(&now);
+  now.hour = (offset_minutes_from_zero_hour_ / 60) % 24;
+  now.minute = offset_minutes_from_zero_hour_ % 60;
+  now.second = 0;
+  now.millisecond = 0;
+  base::Time result;
+  CHECK(base::Time::FromLocalExploded(now, &result));

[James Cook, 2017/05/23 16:34:59]

Will this CHECK-fail and crash at 12:30 AM during daylight savings time
transition? Maybe return a well-known time, or error?

[afakhry, 2017/05/24 04:21:11]

It seems that we have code to handle this case:
https://cs.chromium.org/chromium/src/base/time/time_exploded_posix.cc?q=Time:...

I'm going to follow the same pattern done in Time::LocalMidnight():
https://cs.chromium.org/chromium/src/base/time/time.cc?q=Time::LocalMidnight&...
Since local midnight has the same issue with daylight savings.
Please take a look.

+  return result;
+}
+
+std::string NightLightTime::ToString() const {
+  return base::UTF16ToUTF8(base::TimeFormatTimeOfDay(ToTime()));
+}
+
+}  // namespace ash