Automatically cleanup textures that don't fit in the cache.

Change-Id: I4f29ed96ea11118b391fb957e1e4d1b8fcef1537
diff --git a/libs/hwui/PathCache.h b/libs/hwui/PathCache.h
index 87a9141..206fb49 100644
--- a/libs/hwui/PathCache.h
+++ b/libs/hwui/PathCache.h
@@ -71,6 +71,9 @@
  * Alpha texture used to represent a path.
  */
 struct PathTexture: public Texture {
+    PathTexture(): Texture() {
+    }
+
     /**
      * Left coordinate of the path bounds.
      */