Download SwiftShader component if WebGL is blacklisted

Download SwiftShader component if WebGL is blacklisted

Register with the component updater service if it's discovered that WebGL is blacklisted. Then register the swiftshader library with the GPU data manager.

BUG=26001
TEST=Start up chrome on a blacklisted windows machine, wait a while, and open a webgl page

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=114885

[cpu_(ooo_6.6-7.5), 2011-12-13 20:09:16]

lgtm

Some nits below.

http://codereview.chromium.org/8897008/diff/1/chrome/browser/component_update...
File chrome/browser/component_updater/swiftshader_component_installer.cc
(right):

http://codereview.chromium.org/8897008/diff/1/chrome/browser/component_update...
chrome/browser/component_updater/swiftshader_component_installer.cc:80: 
remove space

http://codereview.chromium.org/8897008/diff/1/chrome/browser/component_update...
chrome/browser/component_updater/swiftshader_component_installer.cc:187:
UpdateChecker *g_update_checker;
remove this from being a global variable.

http://codereview.chromium.org/8897008/diff/1/chrome/browser/component_update...
chrome/browser/component_updater/swiftshader_component_installer.cc:206:
g_update_checker = new UpdateChecker(cus);
this is effectively a local variable, that we leak, note that fact with a
comment here.

[commit-bot: I haz the power, 2011-12-16 19:30:45]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/jbauman@chromium.org/8897008/5001

[commit-bot: I haz the power, 2011-12-16 22:10:46]

Try job failure for 8897008-5001 (retry) on win_rel for step "ui_tests".
It's a second try, previously, steps "browser_tests, ui_tests" failed.
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=win_rel&nu...

[commit-bot: I haz the power, 2011-12-16 22:22:21]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/jbauman@chromium.org/8897008/5001

[commit-bot: I haz the power, 2011-12-16 23:49:45]

Try job failure for 8897008-5001 (retry) on linux_rel for step "browser_tests".
It's a second try, previously, step "browser_tests" failed.
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=linux_rel&...