Enable debug builds in the Android framework

include/core/SkRefCnt.h

Index: include/core/SkRefCnt.h
diff --git a/include/core/SkRefCnt.h b/include/core/SkRefCnt.h
index bf97dc8560529a4d5aa09d635043e4369d0cc5a2..94df80935a90d48d3a39a915f9a89e6b91077aa5 100644
--- a/include/core/SkRefCnt.h
+++ b/include/core/SkRefCnt.h
@@ -57,7 +57,13 @@ public:
     /** Increment the reference count. Must be balanced by a call to unref().
     */
     void ref() const {
+#ifdef SK_BUILD_FOR_ANDROID_FRAMEWORK
+        // Android employs some special subclasses that enable the fRefCnt to
+        // go to zero, but not below, prior to reusing the object.

[bungeman-skia, 2015/08/21 21:44:35]

So after much back and forth and looking into this, SkRefCnt can't really
support what they're trying to do without something breaking. I'm ok with this
change for now if we add to this comment

// This breaks the use of unique() on such objects.
// This should be removed once the Android code is fixed.

[djsollen, 2015/08/24 12:25:43]

Done.

+        SkASSERT(fRefCnt >= 0);
+#else
         SkASSERT(fRefCnt > 0);
+#endif
         (void)sk_atomic_fetch_add(&fRefCnt, +1, sk_memory_order_relaxed);  // No barrier required.
     }