Fix a programmatic smooth scroll bug

Bug: smoothScrollToPosition() stops at child view of which height is
higher than list view itself.

Change-Id: I695ca9db4c706aa7f365967dd3916f9a01917346
Signed-off-by: Yongyi Li <yongyi.li.cn@gmail.com>
Track stack memory in MemoryInfo.

In /proc/pid/maps the main stack is identified as "[stack]". In Linux 3.4
thread stacks are identified as "[stack:<tid>]" where <tid> is the thread ID of
the thread using that stack. Add support in MemInfo's otherStats to track
memory being used by the stack.

Add sanity check on the length of the otherStats array.
Add detail messages to two null pointer exceptions.

Bug: 8265251

Change-Id: I2b228b147da9bdc5c7a4d825dfc628fcc7923927