Add hover affordance for checkboxes.

BUG=353991
NOTRY=true

Review URL: https://codereview.chromium.org/208393016

git-svn-id: svn://svn.chromium.org/blink/trunk@169864 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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

@@ -39,6 +39,18 @@ input[type="checkbox"] {
     flex-shrink: 0;
 }
 
+label:hover {
+    cursor: pointer;
+}
+
+label:hover input {
+    box-shadow: 0 0 3px highlight;
+}
+
+fieldset[disabled] label:hover input {
+    box-shadow: none;
+}
+
 .fill {
     position: absolute;
     top: 0;