Fix VideoDecoderShim to dimiss textures after the stream is resized.

Fix VideoDecoderShim to dimiss textures after the stream is resized.

When frame size changes VideoDecoderShim is supposed to dismiss all
textures with the old size, but it wasn't doing it properly.

BUG=460280
Committed: https://crrev.com/74d739927f3dde4ac09467031afe791dbd73d6e1
Cr-Commit-Position: refs/heads/master@{#317344}

[Sergey Ulanov, 2015-02-20 06:17:17]

Patchset #1 (id:1) has been deleted

[Sergey Ulanov, 2015-02-20 06:17:37]

sergeyu@chromium.org changed reviewers:
+ bbudge@chromium.org

[bbudge, 2015-02-20 13:48:41]

LGTM Thanks for fixing this.

[Sergey Ulanov, 2015-02-20 16:45:24]

The CQ bit was checked by sergeyu@chromium.org

[commit-bot: I haz the power, 2015-02-20 16:46:02]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/937413002/20001

[commit-bot: I haz the power, 2015-02-20 17:36:18]

Committed patchset #1 (id:20001)

[commit-bot: I haz the power, 2015-02-20 17:36:43]

Patchset 1 (id:??) landed as
https://crrev.com/74d739927f3dde4ac09467031afe791dbd73d6e1
Cr-Commit-Position: refs/heads/master@{#317344}