[ESLint] Fix violations when enabling curly rule in eslint.

tracing/tracing/ui/timeline_display_transform_animations.html

Index: tracing/tracing/ui/timeline_display_transform_animations.html
diff --git a/tracing/tracing/ui/timeline_display_transform_animations.html b/tracing/tracing/ui/timeline_display_transform_animations.html
index a1f5ecff9b15209f6e53d9802d5aeacb3b422174..29bdfffde27321fb6fa2bf90023fabd2ebb9e406 100644
--- a/tracing/tracing/ui/timeline_display_transform_animations.html
+++ b/tracing/tracing/ui/timeline_display_transform_animations.html
@@ -26,10 +26,11 @@ tr.exportTo('tr.ui', function() {
       deltaX, deltaY, opt_durationMs) {
     this.deltaX = deltaX;
     this.deltaY = deltaY;
-    if (opt_durationMs === undefined)
+    if (opt_durationMs === undefined) {
       this.durationMs = kDefaultPanAnimationDurationMs;
-    else
+    } else {
       this.durationMs = opt_durationMs;
+    }
 
     this.startPanX = undefined;
     this.startPanY = undefined;
@@ -70,8 +71,9 @@ tr.exportTo('tr.ui', function() {
       percentDone = tr.b.clamp(percentDone, 0, 1);
 
       target.panX = tr.b.lerp(percentDone, this.startPanX, this.goalPanX);
-      if (this.affectsPanY)
+      if (this.affectsPanY) {
         target.panY = tr.b.lerp(percentDone, this.startPanY, this.goalPanY);
+      }
       return timestamp >= this.startTimeMs + this.durationMs;
     },
 
@@ -115,10 +117,11 @@ tr.exportTo('tr.ui', function() {
     this.goalFocalPointXView = goalFocalPointXView;
     this.goalFocalPointY = goalFocalPointY;
     this.zoomInRatioX = zoomInRatioX;
-    if (opt_durationMs === undefined)
+    if (opt_durationMs === undefined) {
       this.durationMs = kDefaultPanAnimationDurationMs;
-    else
+    } else {
       this.durationMs = opt_durationMs;
+    }
 
     this.startTimeMs = undefined;
     this.startScaleX = undefined;