Add placement new macros to SkPostConfig, call SkNEW* from Ganesh.

TODO: unify with the placement new implementation in SkTemplatesPriv.h,
once various issues there are overcome. reed@ should be taking the lead
there.

http://codereview.appspot.com/6384043/



git-svn-id: http://skia.googlecode.com/svn/trunk@4492 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/gpu/GrPlotMgr.h b/src/gpu/GrPlotMgr.h
index 0e631a9..38589f3 100644
--- a/src/gpu/GrPlotMgr.h
+++ b/src/gpu/GrPlotMgr.h
@@ -22,7 +22,7 @@
         if (needed <= sizeof(fStorage)) {
             fBusy = fStorage;
         } else {
-            fBusy = new char[needed];
+            fBusy = SkNEW_ARRAY(char, needed);
         }
         this->reset();
     }