Add memory pressure script

- Added mempressure.py to throw memory pressure intents
- Adjusted MemoryPressureListener so all callers shared the same intents

BUG=

Review URL: https://codereview.chromium.org/24478004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@227339 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 227339
Fix adb_gdb script.

Fix a typo in the script.
BUG=304931
R=digit@chromium.org

Review URL: https://codereview.chromium.org/26337002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@227340 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 227340