[Devtools] Network waterfall to use Path2D to draw in layers

third_party/WebKit/Source/devtools/front_end/externs.js

Index: third_party/WebKit/Source/devtools/front_end/externs.js
diff --git a/third_party/WebKit/Source/devtools/front_end/externs.js b/third_party/WebKit/Source/devtools/front_end/externs.js
index e203c2626ca54534a3e6e862d4ad31595570e6ee..73a27f3a09ee70ca6fe7d47ab71f405a2007fbd0 100644
--- a/third_party/WebKit/Source/devtools/front_end/externs.js
+++ b/third_party/WebKit/Source/devtools/front_end/externs.js
@@ -380,7 +380,16 @@ Path2D.prototype = {
    * @param {number} x
    * @param {number} y
    */
-  lineTo: function(x, y) {}
+  lineTo: function(x, y) {},
+  /**
+   * @param {number} x
+   * @param {number} y
+   * @param {number} radius
+   * @param {number} startAngle
+   * @param {number} endAngle
+   * @param {number=} anticlockwise
+   */
+  arc: function(x, y, radius, startAngle, endAngle, anticlockwise) {}
 };
 
 /** @constructor */