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/GrClipMaskManager.h b/src/gpu/GrClipMaskManager.h
index bb597ba..8106185 100644
--- a/src/gpu/GrClipMaskManager.h
+++ b/src/gpu/GrClipMaskManager.h
@@ -38,7 +38,7 @@
     , fStack(sizeof(GrClipStackFrame)) {
         // We need an initial frame to capture the clip state prior to 
         // any pushes
-        new (fStack.push_back()) GrClipStackFrame();
+        SkNEW_PLACEMENT(fStack.push_back(), GrClipStackFrame);
     }
 
     ~GrClipMaskCache() {
@@ -87,7 +87,7 @@
      * reduce the mask creation cost?
      */
     void push() {
-        new (fStack.push_back()) GrClipStackFrame();
+        SkNEW_PLACEMENT(fStack.push_back(), GrClipStackFrame);
     }
 
     void pop() {