ActivityTrigger: New class to invoke when activity starts/resumes

This changes is combination of following commits:
1) Author: David Ng <dave@codeaurora.org>
   Proprietary client library needs to know activity name. Example:app
   trigger
   Change-Id: I3078ef90d0b1846cdbbf9eaefd68544263936040
2) Author: Rajulu Ponnada <rajulu@codeaurora.org>
   Change activity trigger api to include activity flags which can be
   changed if required in vendor specific library.
   Change-Id: Icfaab21fd4c5a6290f226a338870b9031d32b498
3) Author: Rajulu Ponnada <rajulu@codeaurora.org>
   support for opening/loading multiple dynamic libraries when apps'
   activity start/resume invoked
   Change-Id: Icf42e426870ee634920c2288e4075699c472d3a6
4) Author: Xin Qi <xqi@codeaurora.org>
   GetStringUTFChars() does not release memory untill
   ReleaseStringUTFChars() is called and causes memory leak. This
   change uses ReleaseStringUTFChars() to release unused buffer.
   Change-Id: If7f27ea35f5a1d1dd7c98fbe5f92729ab9ba0257

Change-Id: I089f1669e5711efcabbf1985d80b48c6e92893c6