Theme Customizer: Do not attempt to grab the contents of the preview iframe to populate the window title. Reverts plugins repo revision 508947. see #19910.

git-svn-id: http://core.svn.wordpress.org/trunk@20250 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Theme Customizer: If a section has no settings, prevent it from being rendered. see #19910.

git-svn-id: http://core.svn.wordpress.org/trunk@20251 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Compress scripts/styles: 3.4-alpha-20251.

git-svn-id: http://core.svn.wordpress.org/trunk@20252 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Theme Customizer: Plupload does not support objects in its multipart_params setting (which causes exceptions in Firefox). Use multidimensional keys to circumnavigate this issue. see #19910.

git-svn-id: http://core.svn.wordpress.org/trunk@20253 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Theme Customizer: Make dropdown-pages a native customize control. see #19910.

While the customize_render_control- action has been removed, we could still accomplish this with the customize_render_setting action. That said, in this case, avoiding native integration was a matter of minor semantics that ended in the same result.

git-svn-id: http://core.svn.wordpress.org/trunk@20254 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Compress scripts/styles: 3.4-alpha-20255.

git-svn-id: http://core.svn.wordpress.org/trunk@20255 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Instantiate an object in get_default_link_to_edit(). fixes #20280.

git-svn-id: http://core.svn.wordpress.org/trunk@20256 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Theme Customizer: In JavaScript, add the ability to execute a callback once a set of values have been initialized. see #19910.

git-svn-id: http://core.svn.wordpress.org/trunk@20257 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Compress scripts/styles: 3.4-alpha-20258.

git-svn-id: http://core.svn.wordpress.org/trunk@20258 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Theme Customizer: Ensure background_color and background_image exist instead of blindly attempting to access their controls. see #19910.

git-svn-id: http://core.svn.wordpress.org/trunk@20259 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Theme Customizer: Add a WP_Customize_Setting->visibility parameter to show/hide a control based upon the value of another control. Also shifts rendering the setting wrapper element into WP_Customize_Setting->render() and adds WP_Customize_Setting->render_content(). see #19910.

git-svn-id: http://core.svn.wordpress.org/trunk@20260 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Theme Customizer: Only show uploader 'remove' links when there is an image to remove. see #19910.

git-svn-id: http://core.svn.wordpress.org/trunk@20261 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Compress scripts/styles: 3.4-alpha-20262.

git-svn-id: http://core.svn.wordpress.org/trunk@20262 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Theme Customizer: Add background repeat, position, and attachment settings. Change visibility parameter to accept a string or array( ,  ). see #19910.

git-svn-id: http://core.svn.wordpress.org/trunk@20263 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Compress scripts/styles: 3.4-alpha-20264.

git-svn-id: http://core.svn.wordpress.org/trunk@20264 1a063a9b-81f0-0310-95a4-ce76da25c4cd
s/background/header/ in add_custom_image_header() deprecated function. see #20249

git-svn-id: http://core.svn.wordpress.org/trunk@20265 1a063a9b-81f0-0310-95a4-ce76da25c4cd