Add a html-based visualizer for TurboFan graphs

tools/turbolizer/constants.js

Index: tools/turbolizer/constants.js
diff --git a/tools/turbolizer/constants.js b/tools/turbolizer/constants.js
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+// Copyright 2014 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+var MAX_RANK_SENTINEL = 0;
+var GRAPH_MARGIN = 250;
+var WIDTH = 'width';
+var HEIGHT = 'height';
+var VISIBILITY = 'visibility';
+var SOURCE_PANE_ID = 'left';
+var SOURCE_COLLAPSE_ID = 'source-shrink';
+var SOURCE_EXPAND_ID = 'source-expand';
+var INTERMEDIATE_PANE_ID = 'middle';
+var EMPTY_PANE_ID = 'empty';
+var GRAPH_PANE_ID = 'graph';
+var SCHEDULE_PANE_ID = 'schedule';
+var GENERATED_PANE_ID = 'right';
+var DISASSEMBLY_PANE_ID = 'disassembly';
+var DISASSEMBLY_COLLAPSE_ID = 'disassembly-shrink';
+var DISASSEMBLY_EXPAND_ID = 'disassembly-expand';
+var COLLAPSE_PANE_BUTTON_VISIBLE = 'button-input';
+var COLLAPSE_PANE_BUTTON_INVISIBLE = 'button-input-invisible';