Fimg2d3x: fix icon scaling issue with acceleration enabled

 * replace undefined TRUE/FALSE with true/false in SkFimgApi3x.h
 * fix warning in SkFimgApi3x.cpp

Change-Id: Iabaf66df526892f006573c97450fd36f461d9bb2
Fimg2d: set fimg.isFilter in SkDraw::drawBitmap

Set fimg.isFilter from paint.isFilterBitmap() in drawBitmap like
it's done later in drawRect_withG2D.

Change-Id: I8c27933dba28ae8834f02cb1ba66ec58dd2c933c
Fimg2d: misc fixes

 * always set alpha value to 256 for Fimg2d3x
 * set fimg.srcAddr at NULL on closure of drawBitmap

Change-Id: I45ec5a3e9f3ab3b4f39e264cf6b43135668b4638