texture_image_transport: have a current context when we're releasing textures

In some cases, the TextureImageTransportSurface may get destroyed when no
context is current. When that's the case, glDeleteTextures becomes a noop and we
leak them.

BUG=123933
TEST=manual


Review URL: http://codereview.chromium.org/10200012

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@133732 0039d316-1c4b-4281-b951-d872f2087c98
2 files changed