[turbolizer] Factor out some user actions into methods of GraphView.

tools/turbolizer/util.js

Index: tools/turbolizer/util.js
diff --git a/tools/turbolizer/util.js b/tools/turbolizer/util.js
index 09a747379018c3c650280f30319567abe425c83a..282221af483355bbda5e6dc3a470ae9ceebea5cb 100644
--- a/tools/turbolizer/util.js
+++ b/tools/turbolizer/util.js
@@ -69,3 +69,12 @@ function sortUnique(arr, f) {
   }
   return ret;
 }
+
+// Partial application without binding the receiver
+function partial(f) {
+  var arguments1 = Array.prototype.slice.call(arguments, 1);
+  return function() {
+    var arguments2 = Array.from(arguments);
+    f.apply(this, arguments1.concat(arguments2));
+  }
+}