DevTools: Fix timeline flamechart popover style.

third_party/WebKit/Source/devtools/front_end/ui_lazy/flameChart.css

Index: third_party/WebKit/Source/devtools/front_end/ui_lazy/flameChart.css
diff --git a/third_party/WebKit/Source/devtools/front_end/ui_lazy/flameChart.css b/third_party/WebKit/Source/devtools/front_end/ui_lazy/flameChart.css
index 94177817ecb3804c8db68e5143544d9210972f98..0cd1ac14f010ab567b556b06213a291b2389f9ed 100644
--- a/third_party/WebKit/Source/devtools/front_end/ui_lazy/flameChart.css
+++ b/third_party/WebKit/Source/devtools/front_end/ui_lazy/flameChart.css
@@ -80,11 +80,13 @@
 }
 
 .flame-chart-entry-info:not(:empty) {
-    z-index: 200;
+    z-index: 2000;
     position: absolute;
     background-color: white;
     pointer-events: none;
-    padding: 2px;
+    padding: 4px 8px;
+    white-space: nowrap;
+    max-width: 80%;
     box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.05),
                 0 2px 4px rgba(0, 0, 0, 0.2),
                 0 2px 6px rgba(0, 0, 0, 0.1);