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

tracing/tracing/base/quad.html

Index: tracing/tracing/base/quad.html
diff --git a/tracing/tracing/base/quad.html b/tracing/tracing/base/quad.html
index 2ba997efc6913c23b3a2ae52c12887aca6d4b7ff..79821a2d01143d8747228d9e04e17fb230ab510f 100644
--- a/tracing/tracing/base/quad.html
+++ b/tracing/tracing/base/quad.html
@@ -11,8 +11,9 @@ found in the LICENSE file.
 
 tr.exportTo('tr.b', function() {
   var tmpVec2s = [];
-  for (var i = 0; i < 8; i++)
+  for (var i = 0; i < 8; i++) {
     tmpVec2s[i] = vec2.create();
+  }
 
   var tmpVec2a = vec4.create();
   var tmpVec4a = vec4.create();
@@ -70,8 +71,9 @@ tr.exportTo('tr.b', function() {
   };
 
   Quad.from8Array = function(arr) {
-    if (arr.length !== 8)
+    if (arr.length !== 8) {
       throw new Error('Array must be 8 long');
+    }
     var q = new Quad();
     q.p1[0] = arr[0];
     q.p1[1] = arr[1];