linux/npapi: correctly clip damage rect when checking if the background has changed.

linux/npapi: correctly clip damage rect when checking if the background has changed.

BUG=137623
Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=152061

[piman, 2012-08-16 00:02:52]

Stuart: I know this is code from another era, but see bug. You're the most
familiar with the concepts, can you please give it a look?

[jam, 2012-08-17 00:42:15]

lgtm

[commit-bot: I haz the power, 2012-08-17 00:43:10]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/piman@chromium.org/10857023/1

[commit-bot: I haz the power, 2012-08-17 02:14:26]

Try job failure for 10857023-1 (retry) on linux_rel for step
"interactive_ui_tests".
It's a second try, previously, step "interactive_ui_tests" failed.
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=linux_rel&...

[commit-bot: I haz the power, 2012-08-17 02:56:30]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/piman@chromium.org/10857023/1

[commit-bot: I haz the power, 2012-08-17 04:23:19]

Try job failure for 10857023-1 (retry) on linux_rel for step
"interactive_ui_tests".
It's a second try, previously, step "interactive_ui_tests" failed.
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=linux_rel&...

[commit-bot: I haz the power, 2012-08-17 04:41:11]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/piman@chromium.org/10857023/13002

[commit-bot: I haz the power, 2012-08-17 07:31:13]

Change committed as 152061

[stuartmorgan, 2012-08-18 05:49:46]

LGTM