am b755f9a3: Do not grow if we are invoked for an external allocation.

Merge commit 'b755f9a3caeaf65e95480ac66c2c95553bf79389' into gingerbread-plus-aosp

* commit 'b755f9a3caeaf65e95480ac66c2c95553bf79389':
  Do not grow if we are invoked for an external allocation.