Refactor part of CompositorImpl::SetVisible() into its own method.

Refactor part of CompositorImpl::SetVisible() into its own method.

Add method CompositorImpl::CreateLayerTreeHost() and move part of
CompositorImpl::SetVisible() that creates LayerTreeHost into it.

BUG=

Committed: https://crrev.com/b2101b61fd870b4b8f8a8a1421b355cda635649f
Cr-Commit-Position: refs/heads/master@{#307221}

[auygun, 2014-12-05 14:38:14]

auygun@opera.com changed reviewers:
+ aelias@chromium.org, sievers@chromium.org

[auygun, 2014-12-05 14:41:03]

On 2014/12/05 14:38:14, auygun wrote:
> mailto:auygun@opera.com changed reviewers:
> + mailto:aelias@chromium.org, mailto:sievers@chromium.org

@reviewer: Does this patch look OK to you?

[auygun, 2014-12-05 14:50:01]

On 2014/12/05 14:41:03, auygun wrote:
> On 2014/12/05 14:38:14, auygun wrote:
> > mailto:auygun@opera.com changed reviewers:
> > + mailto:aelias@chromium.org, mailto:sievers@chromium.org
> 
> @reviewer: Does this patch look OK to you?

FYI, this is causing lots of conflicts that are painful to work with. if we can
get this change upstreamed, it would make our infrastructure adaption patch
quite a bit nicer to rebase.

[aelias_OOO_until_Jul13, 2014-12-05 19:38:00]

lgtm

https://codereview.chromium.org/782723002/diff/1/content/browser/renderer_hos...
File content/browser/renderer_host/compositor_impl_android.cc (right):

https://codereview.chromium.org/782723002/diff/1/content/browser/renderer_hos...
content/browser/renderer_host/compositor_impl_android.cc:392: void
CompositorImpl::CreateLayerTreeHost() {
Please add "DCHECK(!host_);" at the beginning.

[auygun, 2014-12-08 09:18:55]

On 2014/12/05 19:38:00, aelias wrote:
> lgtm
> 
>
https://codereview.chromium.org/782723002/diff/1/content/browser/renderer_hos...
> File content/browser/renderer_host/compositor_impl_android.cc (right):
> 
>
https://codereview.chromium.org/782723002/diff/1/content/browser/renderer_hos...
> content/browser/renderer_host/compositor_impl_android.cc:392: void
> CompositorImpl::CreateLayerTreeHost() {
> Please add "DCHECK(!host_);" at the beginning.

Thank you.

[auygun, 2014-12-08 09:19:19]

The CQ bit was checked by auygun@opera.com

[commit-bot: I haz the power, 2014-12-08 09:19:46]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/782723002/20001

[commit-bot: I haz the power, 2014-12-08 10:46:31]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2014-12-08 10:48:08]

Patchset 2 (id:??) landed as
https://crrev.com/b2101b61fd870b4b8f8a8a1421b355cda635649f
Cr-Commit-Position: refs/heads/master@{#307221}