Code: long Chapters::Edition::Parse(IMkvReader* pReader, long long pos,
 long long size) {
 const long long stop = pos + size;

 while (pos < stop) {
 long long id, size;

 long status = ParseElementHeader(pReader, pos, stop, id, size);

 if (status < 0) // error
 return status;

 if (size == 0) // weird
 continue;

 if (id == 0x36) { // Atom ID
      status = ParseAtom(pReader, pos, size);

 if (status < 0) // error
 return status;

     }
 
     pos += size;
    assert(pos <= stop);
   }
 
  assert(pos == stop);
   return 0;
 }

Commit Message: external/libvpx/libwebm: Update snapshot

Update libwebm snapshot. This update contains security fixes from upstream.

Upstream git hash: 229f49347d19b0ca0941e072b199a242ef6c5f2b

BUG=23167726

Change-Id: Id3e140e7b31ae11294724b1ecfe2e9c83b4d4207
(cherry picked from commit d0281a15b3c6bd91756e453cc9398c5ef412d99a)

CWE ID: CWE-20
long Chapters::Edition::Parse(IMkvReader* pReader, long long pos,
 long long size) {
 const long long stop = pos + size;

 while (pos < stop) {
 long long id, size;

 long status = ParseElementHeader(pReader, pos, stop, id, size);

 if (status < 0) // error
 return status;

 if (size == 0) // weird
 continue;

 if (id == 0x36) { // Atom ID
      status = ParseAtom(pReader, pos, size);

 if (status < 0) // error
 return status;

     }
 
     pos += size;
    if (pos > stop)
      return E_FILE_FORMAT_INVALID;
   }
 
  if (pos != stop)
    return E_FILE_FORMAT_INVALID;
   return 0;
 }
