Previously it couldn't be included alone. Also add a header and include guard, and fix its siblings' include guards. Bug: https://code.google.com/p/android/issues/detail?id=82638 Change-Id: I32139a4bda0a6b015508a2319bf4e1a1453345f2
Change-Id: I866097d8468aa8f326117d072444ebbc2a690719