ac75f56600
Move ContentLoader and FileLoader to this new way as they involves IO. Will work on CacheLoader later. Change StreamLoader to contain a Handler instead of derive from a Handler so that the Handler can be created in the thread where load() is called. Rename StreamLoader's old "LoadListener mHandler" to mLoadListener. Remove unused import and unreachable exception. Fix http://b/issue?id=2158613 This improved page_cycler performance in moz/intl by 10-30% as we are not blocked by IO any more.