Fix accumulation error with front_timestamp, move test only code.

media/filters/audio_clock_unittest.cc

Index: media/filters/audio_clock_unittest.cc
diff --git a/media/filters/audio_clock_unittest.cc b/media/filters/audio_clock_unittest.cc
index 2144bb0d67037504d93ee59d04a0b85bcd936b55..0e60abd379c68c3b4a309dd40944141cbc252525 100644
--- a/media/filters/audio_clock_unittest.cc
+++ b/media/filters/audio_clock_unittest.cc
@@ -40,16 +40,21 @@ class AudioClockTest : public testing::Test {
   }
 
   int ContiguousAudioDataBufferedInDays() {
-    return clock_.contiguous_audio_data_buffered().InDays();
+    base::TimeDelta total, same_rate_total;
+    clock_.ContiguousAudioDataBufferedForTesting(&total, &same_rate_total);
+    return total.InDays();
   }
 
   int ContiguousAudioDataBufferedInMilliseconds() {
-    return clock_.contiguous_audio_data_buffered().InMilliseconds();
+    base::TimeDelta total, same_rate_total;
+    clock_.ContiguousAudioDataBufferedForTesting(&total, &same_rate_total);
+    return total.InMilliseconds();
   }
 
   int ContiguousAudioDataBufferedAtSameRateInMilliseconds() {
-    return clock_.contiguous_audio_data_buffered_at_same_rate()
-        .InMilliseconds();
+    base::TimeDelta total, same_rate_total;
+    clock_.ContiguousAudioDataBufferedForTesting(&total, &same_rate_total);
+    return same_rate_total.InMilliseconds();
   }
 
   const int sample_rate_;
@@ -73,15 +78,6 @@ TEST_F(AudioClockTest, BackTimestampStartsAtStartTimestamp) {
   EXPECT_EQ(expected, clock.back_timestamp());
 }
 
-TEST_F(AudioClockTest, ContiguousAudioDataBufferedStartsAtZero) {
-  EXPECT_EQ(base::TimeDelta(), clock_.contiguous_audio_data_buffered());
-}
-
-TEST_F(AudioClockTest, ContiguousAudioDataBufferedAtSameRateStartsAtZero) {
-  EXPECT_EQ(base::TimeDelta(),
-            clock_.contiguous_audio_data_buffered_at_same_rate());
-}
-
 TEST_F(AudioClockTest, Playback) {
   // The first time we write data we should still expect our start timestamp
   // due to delay.