Removing the use of base::Time inside the LayerTreeHost system.

base/time/time_unittest.cc

Index: base/time/time_unittest.cc
diff --git a/base/time/time_unittest.cc b/base/time/time_unittest.cc
index e78a61cf4bdcd1bb2fa8fe96d2ad171877944821..6cfe787c674c30aa7f06cb42c949c13a3298d361 100644
--- a/base/time/time_unittest.cc
+++ b/base/time/time_unittest.cc
@@ -4,6 +4,8 @@
 
 #include "base/time/time.h"
 
+#include <cmath>
+
 #include <time.h>
 
 #include "base/compiler_specific.h"
@@ -660,6 +662,47 @@ TEST(TimeTicks, NowFromSystemTraceTime) {
   HighResClockTest(&TimeTicks::NowFromSystemTraceTime);
 }
 
+TEST(TimeTicks, WebKitConversion) {
+  double double_null = 0;
+  double double_max = std::numeric_limits<double>::max();
+  double double_min = std::numeric_limits<double>::lowest();
+  double double_positive_inf = std::numeric_limits<double>::infinity();
+  double double_negative_inf = -std::numeric_limits<double>::infinity();
+
+  TimeTicks ticks_null = TimeTicks();
+  TimeTicks ticks_min =
+      TimeTicks::FromInternalValue(std::numeric_limits<int64>::min());
+  TimeTicks ticks_max =
+      TimeTicks::FromInternalValue(std::numeric_limits<int64>::max());
+
+  EXPECT_EQ(ticks_null, TimeTicks::FromWebKit(double_null));
+  EXPECT_EQ(ticks_max, TimeTicks::FromWebKit(double_max));
+  EXPECT_EQ(ticks_min, TimeTicks::FromWebKit(double_min));
+  EXPECT_EQ(ticks_max, TimeTicks::FromWebKit(double_positive_inf));
+  EXPECT_EQ(ticks_min, TimeTicks::FromWebKit(double_negative_inf));
+
+  EXPECT_EQ(double_null, ticks_null.ToWebKit());
+  EXPECT_EQ(double_negative_inf, ticks_min.ToWebKit());
+  EXPECT_EQ(double_positive_inf, ticks_max.ToWebKit());
+
+  // Round trip some values
+  // Outside of 2**53 the int64->double->int64 round trip isn't exact.
+  for (int i = -53; i < 53; i++) {
+    if (!i)
+      continue;
+
+    SCOPED_TRACE(i);
+    double i_abs = abs(static_cast<double>(i));
+
+    TimeTicks ticks_value = TimeTicks::FromInternalValue(
+        static_cast<int64>((i / i_abs) * pow(2.0, i_abs)));
+    EXPECT_EQ(TimeTicks::FromWebKit(ticks_value.ToWebKit()), ticks_value);
+
+    double double_value = (i / i_abs) * pow(2.0, i_abs) / 1e6;
+    EXPECT_EQ(TimeTicks::FromWebKit(double_value).ToWebKit(), double_value);
+  }
+}
+
 TEST(TimeDelta, FromAndIn) {
   EXPECT_TRUE(TimeDelta::FromDays(2) == TimeDelta::FromHours(48));
   EXPECT_TRUE(TimeDelta::FromHours(3) == TimeDelta::FromMinutes(180));