[3171580] don't automatically log GraphicBuffer allocation failures

some of these failures are not fatal and even expected in some cases
so they should not emit a dump in the log in those cases.

Change-Id: Idcfa252e3bfa9d74e27fe4ad8f8623aa01aa9c5e
diff --git a/include/ui/GraphicBufferAllocator.h b/include/ui/GraphicBufferAllocator.h
index 54b8236..dffa788 100644
--- a/include/ui/GraphicBufferAllocator.h
+++ b/include/ui/GraphicBufferAllocator.h
@@ -68,6 +68,7 @@
     status_t free(buffer_handle_t handle);
 
     void dump(String8& res) const;
+    static void dumpToSystemLog();
 
 private:
     struct alloc_rec_t {