add a "most" target, and make it the default

split out of https://codereview.appspot.com/6651064/ ('gyp: generate "everything" and "most" targets instead of "all"')
tests: "make most" now works, "make" now calls "make most"
Review URL: https://codereview.appspot.com/6740045

git-svn-id: http://skia.googlecode.com/svn/trunk@5999 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/skia.gyp b/skia.gyp
index d41df7f..0f3f375 100644
--- a/skia.gyp
+++ b/skia.gyp
@@ -20,6 +20,7 @@
 
         'gyp/bench.gyp:bench',
         'gyp/gm.gyp:gm',
+        'gyp/most.gyp:most',
         'gyp/SampleApp.gyp:SampleApp',
         'gyp/tests.gyp:tests',
         'gyp/tools.gyp:tools',