Make Android StreamTexture impl self-contained

This moves code from gpu_channel.cc to stream_texture_manager_android.cc
by adding the StreamTexture as a service-side routed listener.

This should allow me to convert StreamTexture into a GLImage-derived
class, since the rest of the code can be more agnostic now.

BUG=334919,282700

Review URL: https://codereview.chromium.org/145423003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@246704 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 246704