Enable the Core Animation NPAPI drawing mode on 10.6 (except for QuickTime)

Enable the Core Animation NPAPI drawing mode on 10.6 (except for QuickTime)

Allows plugins other than QuickTime (see http://crbug.com/38336) to negotiate the Core Animation drawing model.

Note that for the moment, our wmode hack will prevent Flash from trying to use Core Animation; that will be removed later.

BUG=32012
TEST=On 10.6: Unity3D should not use any renderer CPU on most sites, and should now have good performance; QuickTime and Flash10.1 should be unchanged for now. On 10.5: Everything should be unchanged.

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=42285

[Avi (use Gerrit), 2010-03-18 01:28:42]

http://codereview.chromium.org/1064003/diff/1/3
File webkit/glue/plugins/plugin_host.cc (right):

http://codereview.chromium.org/1064003/diff/1/3#newcode799
webkit/glue/plugins/plugin_host.cc:799: // negiate that model.
negotiate

[pink (ping after 24hrs), 2010-03-18 17:00:29]

LGTM

http://codereview.chromium.org/1064003/diff/1/3
File webkit/glue/plugins/plugin_host.cc (right):

http://codereview.chromium.org/1064003/diff/1/3#newcode800
webkit/glue/plugins/plugin_host.cc:800: scoped_refptr<NPAPI::PluginInstance>
plugin = FindInstance(id);
is this guaranteed to succeed?

[stuartmorgan, 2010-03-18 18:10:08]

http://codereview.chromium.org/1064003/diff/1/3
File webkit/glue/plugins/plugin_host.cc (right):

http://codereview.chromium.org/1064003/diff/1/3#newcode799
webkit/glue/plugins/plugin_host.cc:799: // negiate that model.
On 2010/03/18 01:28:42, Avi wrote:
> negotiate

Done.

http://codereview.chromium.org/1064003/diff/1/3#newcode800
webkit/glue/plugins/plugin_host.cc:800: scoped_refptr<NPAPI::PluginInstance>
plugin = FindInstance(id);
On 2010/03/18 17:00:29, pink wrote:
> is this guaranteed to succeed?

The code in this file in not consistent about check, but I'll err or the side of
safety and add a check.

[stuartmorgan, 2010-03-22 19:35:42]

FYI: I've stripped the Flash wmode change out of this to decouple the basic
enabling of Core Animation from fixing any Flash-specific issues (e.g., the
issue we're currently seeing with full-screen Flash). No need for a new review.