Revert of Delete cricket::VideoFrame::GetTimeStamp.

webrtc/media/engine/webrtcvideoframe_unittest.cc

Index: webrtc/media/engine/webrtcvideoframe_unittest.cc
diff --git a/webrtc/media/engine/webrtcvideoframe_unittest.cc b/webrtc/media/engine/webrtcvideoframe_unittest.cc
index 3743e8789958d3c07e46216fa1f43055b7d375ca..37153bb47b84c2d62565e5f185dad18f7a441afc 100644
--- a/webrtc/media/engine/webrtcvideoframe_unittest.cc
+++ b/webrtc/media/engine/webrtcvideoframe_unittest.cc
@@ -186,13 +186,15 @@
   webrtc::NativeHandleBuffer* buffer =
       new rtc::RefCountedObject<webrtc::test::FakeNativeHandleBuffer>(
           dummy_handle, 640, 480);
-
-  WebRtcVideoFrame frame(buffer, webrtc::kVideoRotation_0, 20);
+  // Timestamp is converted from ns to us, so last three digits are lost.
+  WebRtcVideoFrame frame(buffer, 20000, webrtc::kVideoRotation_0);
   EXPECT_EQ(dummy_handle, frame.video_frame_buffer()->native_handle());
   EXPECT_EQ(640, frame.width());
   EXPECT_EQ(480, frame.height());
+  EXPECT_EQ(20000, frame.GetTimeStamp());
   EXPECT_EQ(20, frame.timestamp_us());
   frame.set_timestamp_us(40);
+  EXPECT_EQ(40000, frame.GetTimeStamp());
   EXPECT_EQ(40, frame.timestamp_us());
 }