Revert "Revert of FrameBuffer for the new jitter buffer. (patchset #9 id:160001 of https://codereview.webrtc.org/1969403007/ )"

Also disabled modules_unittest.TestFrameBuffer2.* in drmemory.

This reverts commit b711f10d9683b9de6ee78186f77b225fc7ebfb8f.

TBR=honghaiz@webrtc.org

BUG=

Review URL: https://codereview.webrtc.org/1991133003 .

Cr-Commit-Position: refs/heads/master@{#12806}
diff --git a/webrtc/modules/video_coding/frame_object.cc b/webrtc/modules/video_coding/frame_object.cc
index 1634f89..7b9ec0d 100644
--- a/webrtc/modules/video_coding/frame_object.cc
+++ b/webrtc/modules/video_coding/frame_object.cc
@@ -18,6 +18,7 @@
 FrameObject::FrameObject()
     : picture_id(0),
       spatial_layer(0),
+      timestamp(0),
       num_references(0),
       inter_layer_predicted(false) {}