Add ConsumerBase::isAbandoned

Bug: 20105644
Change-Id: I21526b5397ea51a15500c44a99daa9d75fc4ea67
diff --git a/include/gui/ConsumerBase.h b/include/gui/ConsumerBase.h
index f46bf01..46c603d 100644
--- a/include/gui/ConsumerBase.h
+++ b/include/gui/ConsumerBase.h
@@ -56,6 +56,9 @@
     // or by OpenGL ES as a texture) then those buffer will remain allocated.
     void abandon();
 
+    // Returns true if the ConsumerBase is in the 'abandoned' state
+    bool isAbandoned();
+
     // set the name of the ConsumerBase that will be used to identify it in
     // log messages.
     void setName(const String8& name);