DevTools: Add dark theme hidden experiment

third_party/WebKit/Source/devtools/front_end/inspectorStyle.css

Index: third_party/WebKit/Source/devtools/front_end/inspectorStyle.css
diff --git a/third_party/WebKit/Source/devtools/front_end/inspectorStyle.css b/third_party/WebKit/Source/devtools/front_end/inspectorStyle.css
index 4beee86df446246dc6d5cec97a45f2bf0db94065..b61b3548316cc579104c277ef2ae9efa609eb340 100644
--- a/third_party/WebKit/Source/devtools/front_end/inspectorStyle.css
+++ b/third_party/WebKit/Source/devtools/front_end/inspectorStyle.css
@@ -46,6 +46,10 @@ body {
     color: #222;
 }
 
+body.dark-theme {
+    -webkit-filter: invert(100%);
+}
+
 .platform-linux {
     color: rgb(48, 57, 66);
     font-family: Ubuntu, Arial, sans-serif;
@@ -552,6 +556,7 @@ body.inactive .sidebar-tree-item.selected {
     top: 0;
     right: 0;
     bottom: 0;
+    background: white;

[pfeldman, 2015/11/21 06:07:05]

move this into

body.dark-theme .root-view

[paulirish, 2015/11/21 07:20:14]

done.

 }
 
 .viewport-control-gap-element {