Move TextureLayer into android.graphics

Bug: 155905258
Test: make and boot

It is tightly integrated with android.graphics.HardwareRenderer, and
this follows on I30d34055b6870dc1039f190a88f4a747cee17300, which moved
the native component into android_graphics_TextureLayer.cpp, and
Ifa044281a3c36cbc1b413175711e9b172cda640f, which registers its JNI along
with other graphics classes.

Make TextureLayer AutoCloseable, replacing destroy() with close(). Add
annotations where appropriate.

Change-Id: I1b146ff02a20751246636144c88fe6f8eec43514