https://bugs.webkit.org/show_bug.cgi?id=122676

Reviewed by Timothy Hatcher.

Add a small 'hide' button next to every platform logo, and a 'show all'
button which only appears when at least one platform is hidden. Hidden
platforms persist using localStorage.

* BuildSlaveSupport/build.webkit.org-config/public_html/dashboard/Scripts/Initialization.js:
* BuildSlaveSupport/build.webkit.org-config/public_html/dashboard/Scripts/Main.js:
(updateHiddenPlatforms):
(documentReady.unhideButton):
(documentReady.hideButton):
(documentReady):
* BuildSlaveSupport/build.webkit.org-config/public_html/dashboard/Scripts/Settings.js: Added.
(Settings.prototype.setObject):
(Settings.prototype.getObject):
(Settings.prototype.addSettingListener):
(Settings.prototype.fireSettingListener):
(Settings.prototype.toggleHiddenPlatform):
(Settings.prototype.clearHiddenPlatforms):
* BuildSlaveSupport/build.webkit.org-config/public_html/dashboard/Styles/Main.css:
(div.cellButton):
(div.cellButton.hide):
(.hidden):
* BuildSlaveSupport/build.webkit.org-config/public_html/dashboard/index.html:


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@159352 268f45cc-cd09-0410-ab3c-d52691b4dbfc