ui: Pass correct image texture target and one-copy settings to cc.

ui: Pass correct image texture target and one-copy settings to cc.

The ui browser compositor should use onecopy for implside painting, as
we have enabled that for all platforms that use ui::Compositor.

The image texture target should also match the one used in the renderer
compositor. So have the ui::Compositor query it from the ContextFactory
and move the code that makes the decision out from RenderProcessHostImpl
to a shared location.

R=piman@chromium.org, reveman
BUG=314185
Committed: https://crrev.com/e6eb185c92a58e034bbe31e89bf3ac7205099527
Cr-Commit-Position: refs/heads/master@{#318551}

[danakj, 2015-02-27 20:18:57]

Patchset #1 (id:1) has been deleted

[danakj, 2015-02-27 20:19:02]

Patchset #1 (id:20001) has been deleted

[reveman, 2015-02-27 20:20:30]

lgtm

[piman, 2015-02-27 21:57:01]

LGTM after compile failure fixed.

[danakj, 2015-02-27 22:30:01]

The CQ bit was checked by danakj@chromium.org

[danakj, 2015-02-27 22:30:01]

The patchset sent to the CQ was uploaded after l-g-t-m from
reveman@chromium.org, piman@chromium.org
Link to the patchset: https://codereview.chromium.org/963223002/#ps80001 (title:
"usetexturetarget: .")

[commit-bot: I haz the power, 2015-02-27 22:30:43]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/963223002/80001

[danakj, 2015-02-27 22:51:18]

The CQ bit was checked by danakj@chromium.org

[danakj, 2015-02-27 22:51:19]

The patchset sent to the CQ was uploaded after l-g-t-m from
reveman@chromium.org, piman@chromium.org
Link to the patchset: https://codereview.chromium.org/963223002/#ps100001
(title: "usetexturetarget: exportswitch")

[danakj, 2015-02-27 22:51:40]

Patchset #4 (id:100001) has been deleted

[danakj, 2015-02-27 22:51:52]

The CQ bit was checked by danakj@chromium.org

[danakj, 2015-02-27 22:51:53]

The patchset sent to the CQ was uploaded after l-g-t-m from
reveman@chromium.org, piman@chromium.org
Link to the patchset: https://codereview.chromium.org/963223002/#ps120001
(title: "usetexturetarget: exportswitch")

[commit-bot: I haz the power, 2015-02-27 22:52:01]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/963223002/120001

[commit-bot: I haz the power, 2015-02-27 23:52:20]

Committed patchset #4 (id:120001)

[commit-bot: I haz the power, 2015-02-27 23:53:02]

Patchset 4 (id:??) landed as
https://crrev.com/e6eb185c92a58e034bbe31e89bf3ac7205099527
Cr-Commit-Position: refs/heads/master@{#318551}