Enable partial recording if slimmingPaintDisplayItemCache is enabled

Enable partial recording if slimmingPaintDisplayItemCache is enabled

BUG=444163
R=enne@chromium.org
TBR=kbr@chromium.org (trivial change in render_widget_compositor.cc which is really related to cc/)

Committed: https://crrev.com/8244b9d3cc452a101ec01261b2a632296ed10bdc
Cr-Commit-Position: refs/heads/master@{#316244}

[Xianzhu, 2015-02-12 21:28:15]

wangxianzhu@chromium.org changed reviewers:
+ enne@chromium.org, kbr@chromium.org

[Xianzhu, 2015-02-12 22:33:49]

https://codereview.chromium.org/913163004/diff/1/content/renderer/gpu/render_...
File content/renderer/gpu/render_widget_compositor.cc (right):

https://codereview.chromium.org/913163004/diff/1/content/renderer/gpu/render_...
content/renderer/gpu/render_widget_compositor.cc:201:
blink::WebRuntimeFeatures::enableSlimmingPaint(true);
This is needed because slimmingPaintDisplayItemCacheEnabled will be always false
before enableSlimmingPaint is called. Though we do the same in RenderViewImpl,
it's later than here.

[enne (OOO), 2015-02-12 22:37:55]

lgtm

[Xianzhu, 2015-02-13 17:17:58]

The CQ bit was checked by wangxianzhu@chromium.org

[commit-bot: I haz the power, 2015-02-13 17:18:13]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/913163004/1

[commit-bot: I haz the power, 2015-02-13 18:23:39]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-02-13 18:24:36]

Patchset 1 (id:??) landed as
https://crrev.com/8244b9d3cc452a101ec01261b2a632296ed10bdc
Cr-Commit-Position: refs/heads/master@{#316244}