Fix slow gm debug builds that are doing large path validation runs.

Add a new compile flag to allow path validation to be selectively
enabled instead of being always on.

Review URL: https://codereview.appspot.com/6734059

git-svn-id: http://skia.googlecode.com/svn/trunk@6036 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/core/SkPath.cpp b/src/core/SkPath.cpp
index eb0e485..9723db9 100644
--- a/src/core/SkPath.cpp
+++ b/src/core/SkPath.cpp
@@ -1942,6 +1942,7 @@
     SkASSERT(this != NULL);
     SkASSERT((fFillType & ~3) == 0);
 
+#ifdef SK_DEBUG_PATH
     if (!fBoundsIsDirty) {
         SkRect bounds;
 
@@ -1990,8 +1991,9 @@
         }
     }
     SkASSERT(mask == fSegmentMask);
+#endif // SK_DEBUG_PATH
 }
-#endif
+#endif // SK_DEBUG
 
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