Force-flush state sync on texid change

Bug: 18718646

Caused because the Texture object thought the GLES texture
was in a different state than it was as it persists across
EGL/GL contexts. Fix this by force-flushing the default
values when the texid has changed.

Change-Id: I264bac9a2beb08df8e2ba8a85ad15f0dd1fce22a