DevTools: traverse widget hierarchy to reveal views.

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 b22cebb2bcff782b3154e6b87e6047365aca99d5..ab893413c94ac6ad383a172a013f8873881628e2 100644
--- a/third_party/WebKit/Source/devtools/front_end/ui/inspectorCommon.css
+++ b/third_party/WebKit/Source/devtools/front_end/ui/inspectorCommon.css
@@ -89,6 +89,10 @@ iframe.fill {
     position: relative;
 }
 
+.view-container > .toolbar {
+    border-bottom: 1px solid #eee;
+}
+
 .flex-auto {
     flex: auto;
 }
@@ -107,6 +111,10 @@ iframe.fill {
     justify-content: center;
 }
 
+.overflow-auto {
+    overflow: auto;
+}
+
 iframe.widget {
     position: absolute;
     width: 100%;
@@ -274,6 +282,13 @@ body.inactive select.chrome-select,
     -webkit-box-shadow: inset 0 0 1px rgba(255,255,255,0.5);
 }
 
+.gray-info-message {
+    text-align: center;
+    font-style: italic;
+    padding: 6px;
+    color: #888;
+}
+
 label[is=dt-icon-label] {
     flex: none;
 }