Fix a crash in the PriorityQueue class which occurs while trying to assign an uninitialized iterator member to
a valid iterator instance.

This occurs if we have a valid Pointer instance with a valid iterator being assigned to an empty Pointer instance.
The ListIterator member in this case is uninitialized as per STL conventions and behaves like an uninitialized pointer
leading to crashes when this iterator is assigned to another.

Fix is to have a dummy List class and initialize this iterator to its end.

BUG=none
R=jar@chromium.org, jar

Review URL: https://codereview.chromium.org/75473003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@236076 0039d316-1c4b-4281-b951-d872f2087c98
[Android] Refactor and reuse reraiser_thread thread stack dumping utility.

BUG=None
TEST=reraiser_thread_unittest.py
NOTRY=True
R=frankf@chromium.org

Review URL: https://codereview.chromium.org/76233005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@236077 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 236077