Devtools: Pretty print fix for CSS coverage decorations.

third_party/WebKit/Source/devtools/front_end/components_lazy/LineLevelProfile.js

Index: third_party/WebKit/Source/devtools/front_end/components_lazy/LineLevelProfile.js
diff --git a/third_party/WebKit/Source/devtools/front_end/components_lazy/LineLevelProfile.js b/third_party/WebKit/Source/devtools/front_end/components_lazy/LineLevelProfile.js
index 971bedbfb661420417d0cb3699f4d59062cc3cc8..e0789a67f5383eb19284157df420662a6c32fbb0 100644
--- a/third_party/WebKit/Source/devtools/front_end/components_lazy/LineLevelProfile.js
+++ b/third_party/WebKit/Source/devtools/front_end/components_lazy/LineLevelProfile.js
@@ -134,10 +134,10 @@ WebInspector.LineLevelProfile.LineDecorator = class {
     var gutterType = 'CodeMirror-gutter-performance';
     var decorations = uiSourceCode.lineDecorations(WebInspector.LineLevelProfile.LineDecorator.type);

[lushnikov, 2016/11/11 23:28:01]

let's make .lineDecorations() non-nullable

     textEditor.uninstallGutter(gutterType);
-    if (!decorations)
+    if (!decorations || !decorations.size)
       return;
     textEditor.installGutter(gutterType, false);
-    for (var decoration of decorations.values()) {
+    for (var decoration of decorations) {
       var time = /** @type {number} */ (decoration.data());
       var text = WebInspector.UIString('%.1f\xa0ms', time);
       var intensity = Number.constrain(Math.log10(1 + 2 * time) / 5, 0.02, 1);