subset the goog files.  it speeds up builds significantly on slow computers
Experimental SWC looks like it needs MX.SWC
set closure compiler to 20140303.  More recent versions error on base.js
switch to antlr 3.5.2 from maven.  antlr.org is blocked in some countries, but I couldn't find antlr 3.3 complete on maven.  This version of antlr seems to inject suppresswarning annotations in the file so it looks like we don't need to inject our own, but now we're getting some warnings that we'll have to revisit someday.  Maybe the annotator utility just has to merge suppresswarnings so the compiler doesn't throw errors.
in Eclipse we needed to pick up unittest.properties in order to compile the sdkswctests.  Not sure why this suddenly stopped working