Blink Platform: Remove time functions from Platform.

third_party/WebKit/Source/wtf/CurrentTime.cpp

Index: third_party/WebKit/Source/wtf/CurrentTime.cpp
diff --git a/third_party/WebKit/Source/wtf/CurrentTime.cpp b/third_party/WebKit/Source/wtf/CurrentTime.cpp
index 2c284b1416bbd2e461d0fe15e3f0380de229fe6f..0598cd7a088206e90984d57a3573edf10e75aca0 100644
--- a/third_party/WebKit/Source/wtf/CurrentTime.cpp
+++ b/third_party/WebKit/Source/wtf/CurrentTime.cpp
@@ -30,40 +30,38 @@
 
 #include "wtf/CurrentTime.h"
 
-namespace WTF {
-
-static TimeFunction currentTimeFunction;
-static TimeFunction monotonicallyIncreasingTimeFunction;
-static TimeFunction systemTraceTimeFunction;
+#include "base/time/time.h"
 
-void setCurrentTimeFunction(TimeFunction func)
-{
-    currentTimeFunction = func;
-}
-
-void setMonotonicallyIncreasingTimeFunction(TimeFunction func)
-{
-    monotonicallyIncreasingTimeFunction = func;
-}
+namespace WTF {
 
-void setSystemTraceTimeFunction(TimeFunction func)
-{
-    systemTraceTimeFunction = func;
-}
+static TimeFunction mockTimeFunctionForTesting = nullptr;
 
 double currentTime()
 {
-    return (*currentTimeFunction)();
+    if (mockTimeFunctionForTesting)
+        return mockTimeFunctionForTesting();
+    return base::Time::Now().ToDoubleT();
 }
 
 double monotonicallyIncreasingTime()
 {
-    return (*monotonicallyIncreasingTimeFunction)();
+    if (mockTimeFunctionForTesting)
+        return mockTimeFunctionForTesting();
+    return base::TimeTicks::Now().ToInternalValue() / static_cast<double>(base::Time::kMicrosecondsPerSecond);
 }
 
 double systemTraceTime()
 {
-    return (*systemTraceTimeFunction)();
+    if (mockTimeFunctionForTesting)
+        return mockTimeFunctionForTesting();
+    return (base::TimeTicks::Now() - base::TimeTicks()).InSecondsF();
+}
+
+TimeFunction setTimeFunctionsForTesting(TimeFunction newFunction)
+{
+    TimeFunction oldFunction = mockTimeFunctionForTesting;
+    mockTimeFunctionForTesting = newFunction;
+    return oldFunction;
 }
 
 } // namespace WTF