DevTools: popover, selection and other minor theme tweaks.

third_party/WebKit/Source/devtools/front_end/ui/searchableView.css

Index: third_party/WebKit/Source/devtools/front_end/ui/searchableView.css
diff --git a/third_party/WebKit/Source/devtools/front_end/ui/searchableView.css b/third_party/WebKit/Source/devtools/front_end/ui/searchableView.css
index e346e550a0e7dc18832f34eb2817dfc866ca646b..1ca26aa32180de271253981383e5d5ccdc19c180 100644
--- a/third_party/WebKit/Source/devtools/front_end/ui/searchableView.css
+++ b/third_party/WebKit/Source/devtools/front_end/ui/searchableView.css
@@ -103,6 +103,10 @@
     border-left: 1px solid rgb(163, 163, 163);
 }
 
+:host-context(.-theme-with-dark-background) .toolbar-search-navigation {
+    -webkit-filter: invert(90%);
+}
+
 .toolbar-search-navigation.toolbar-search-navigation-prev.enabled:active {
     background-image: url(Images/searchPrev.png), linear-gradient(rgb(168, 168, 168), rgb(116, 116, 116));
 }