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}

webrtc/modules/video_coding/frame_object.h

@@ -31,6 +31,7 @@ class FrameObject {
   // have to be constructed from the header data relevant to that codec.
   uint16_t picture_id;
   uint8_t spatial_layer;
+  uint32_t timestamp;
 
   size_t num_references;
   uint16_t references[kMaxFrameReferences];