Add a space before seconds units like all other units.

BUG=none
TEST=none (no unit tests for operator<< exist)

Review-Url: https://codereview.chromium.org/2549203002
Cr-Commit-Position: refs/heads/master@{#436790}

base/time/time.cc

@@ -126,7 +126,7 @@ int64_t SaturatedSub(TimeDelta delta, int64_t value) {
 }  // namespace time_internal
 
 std::ostream& operator<<(std::ostream& os, TimeDelta time_delta) {
-  return os << time_delta.InSecondsF() << "s";
+  return os << time_delta.InSecondsF() << " s";
 }
 
 // Time -----------------------------------------------------------------------

base/time/time_unittest.cc

@@ -1116,17 +1116,17 @@ TEST(TimeDeltaLogging, DCheckEqCompiles) {
 
 TEST(TimeDeltaLogging, EmptyIsZero) {
   TimeDelta zero;
-  EXPECT_EQ("0s", AnyToString(zero));
+  EXPECT_EQ("0 s", AnyToString(zero));
 }
 
 TEST(TimeDeltaLogging, FiveHundredMs) {
   TimeDelta five_hundred_ms = TimeDelta::FromMilliseconds(500);
-  EXPECT_EQ("0.5s", AnyToString(five_hundred_ms));
+  EXPECT_EQ("0.5 s", AnyToString(five_hundred_ms));
 }
 
 TEST(TimeDeltaLogging, MinusTenSeconds) {
   TimeDelta minus_ten_seconds = TimeDelta::FromSeconds(-10);
-  EXPECT_EQ("-10s", AnyToString(minus_ten_seconds));
+  EXPECT_EQ("-10 s", AnyToString(minus_ten_seconds));
 }
 
 TEST(TimeDeltaLogging, DoesNotMessUpFormattingFlags) {