Add DecodedImageCallback::Decoded() function with custom decode time value.

webrtc/modules/video_coding/main/source/timing_unittest.cc

Index: webrtc/modules/video_coding/main/source/timing_unittest.cc
diff --git a/webrtc/modules/video_coding/main/source/timing_unittest.cc b/webrtc/modules/video_coding/main/source/timing_unittest.cc
index 694a600c2acb7c1e0cc151d6d58c9652c6fcd5da..8ab2aed92e0e48dbabce5b79aee7dd46b2df8b00 100644
--- a/webrtc/modules/video_coding/main/source/timing_unittest.cc
+++ b/webrtc/modules/video_coding/main/source/timing_unittest.cc
@@ -85,8 +85,10 @@ TEST(ReceiverTiming, Tests) {
   for (int i = 0; i < 10; i++) {
     int64_t startTimeMs = clock.TimeInMilliseconds();
     clock.AdvanceTimeMilliseconds(10);
-    timing.StopDecodeTimer(timeStamp, startTimeMs,
-                           clock.TimeInMilliseconds(), timing.RenderTimeMs(
+    timing.StopDecodeTimer(timeStamp,
+                           clock.TimeInMilliseconds() - startTimeMs,
+                           clock.TimeInMilliseconds(),
+                           timing.RenderTimeMs(
                                timeStamp, clock.TimeInMilliseconds()));
     timeStamp += 90000 / 25;
     clock.AdvanceTimeMilliseconds(1000 / 25 - 10);