DevTools: ui polish for the audits2 panel.

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

Index: third_party/WebKit/Source/devtools/front_end/ui/inspectorCommon.css
diff --git a/third_party/WebKit/Source/devtools/front_end/ui/inspectorCommon.css b/third_party/WebKit/Source/devtools/front_end/ui/inspectorCommon.css
index 14d1ea02c8f9fb235a58ca2666b0a2a8c84e3317..0163cbb120d413fa7ebfc607bf1070e594e3cded 100644
--- a/third_party/WebKit/Source/devtools/front_end/ui/inspectorCommon.css
+++ b/third_party/WebKit/Source/devtools/front_end/ui/inspectorCommon.css
@@ -397,6 +397,11 @@ button.material-button.default {
     background-color: #4285f4 !important;
 }
 
+button.material-button.default:disabled {
+    background-color: #ffffff !important;
+    color: gray;
+}
+
 button.material-button.default:not(:disabled):hover {
     background-color: hsla(217, 89%, 58%, 1) !important;
     color: white !important;