strengthen region validation

Change-Id: I75ee7bc4dd7a2f5357ac8994a23bc8b8bfb6eb44
diff --git a/include/private/ui/RegionHelper.h b/include/private/ui/RegionHelper.h
index 421bdda..8c190dd 100644
--- a/include/private/ui/RegionHelper.h
+++ b/include/private/ui/RegionHelper.h
@@ -26,10 +26,10 @@
 template<typename RECT>
 class region_operator
 {
+public:
     typedef typename RECT::value_type TYPE;    
     static const TYPE max_value = 0x7FFFFFF;
 
-public:
     /* 
      * Common boolean operations:
      * value is computed as 0b101 op 0b110
diff --git a/include/ui/Region.h b/include/ui/Region.h
index 0049fde..43a4450 100644
--- a/include/ui/Region.h
+++ b/include/ui/Region.h
@@ -161,7 +161,8 @@
     static void translate(Region& reg, int dx, int dy);
     static void translate(Region& dst, const Region& reg, int dx, int dy);
 
-    static bool validate(const Region& reg, const char* name);
+    static bool validate(const Region& reg,
+            const char* name, bool silent = false);
     
     // mStorage is a (manually) sorted array of Rects describing the region
     // with an extra Rect as the last element which is set to the