DevTools: add pie chart to the paint profiler overview.

Source/devtools/front_end/layersPanel.css

Index: Source/devtools/front_end/layersPanel.css
diff --git a/Source/devtools/front_end/layersPanel.css b/Source/devtools/front_end/layersPanel.css
index f6d9f2047c056ddfdf2abc776b315870b559ac55..e0adca3e752fbeb070868307e7c3928cf40593ec 100644
--- a/Source/devtools/front_end/layersPanel.css
+++ b/Source/devtools/front_end/layersPanel.css
@@ -77,27 +77,36 @@
     background-color: rgba(100, 100, 100, 0.2);
 }
 
-.paint-profiler-view canvas {
-    z-index: 200;
-    opacity: 0.8;
-    background-color: white;
+.paint-profiler-canvas-container {
+    flex: auto;
+    position: relative;
+}
+
+.paint-profiler-overview {
+    background-color: rgb(244, 244, 244);
 }
 
-.paint-profiler-view {
+.paint-profiler-pie-chart {
+    width: 60px;
+    height: 60px;
+    padding: 2px;
     overflow: hidden;
 }
 
-.paint-profiler-view .overview-grid-dividers-background,
-.paint-profiler-view .overview-grid-window {
+.paint-profiler-canvas-container canvas {
+    z-index: 200;
+    background-color: white;
+    opacity: 0.95;
+    height: 100%;
+    width: 100%;
+}
+
+.paint-profiler-canvas-container .overview-grid-dividers-background,
+.paint-profiler-canvas-container .overview-grid-window {
     bottom: 0;
     height: auto;
 }
 
-.paint-profiler-view .overview-grid-window-resizer {
+.paint-profiler-canvas-container .overview-grid-window-resizer {
     z-index: 2000;
 }
-
-.paint-profiler-view canvas {
-    height: 100%;
-    width: 100%;
-}