[Interpreter] Add visualization tool for Ignition dispatch counters.

tools/ignition/bytecode_dispatches_report_test.py

+# Copyright 2016 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.
+
+import bytecode_dispatches_report as bdr
+import unittest
+
+
+class BytecodeDispatchesReportTest(unittest.TestCase):
+  def test_find_top_counters(self):
+    top_counters = bdr.find_top_counters({
+      "a": {"a": 10, "b": 8, "c": 99},
+      "b": {"a":  1, "b": 4, "c":  1},
+      "c": {"a": 42, "b": 3, "c":  7}}, 5)
+    self.assertListEqual(top_counters, [
+      ('a', 'c', 99),
+      ('c', 'a', 42),
+      ('a', 'a', 10),
+      ('a', 'b',  8),
+      ('c', 'c',  7)])
+

[rmcilroy, 2016/04/12 16:25:52]

two newlines

[Stefano Sanfilippo, 2016/04/12 16:56:32]

These are methods of the test class, am I wrong in saying that it should be one
blank line between them?

[rmcilroy, 2016/04/13 08:36:05]

Sorry you are right.

+  def test_build_counters_matrix(self):
+    counters_matrix, xlabels, ylabels = bdr.build_counters_matrix({
+      "a": {"a": 10, "b":  8, "c":  7},
+      "b": {"a":  1, "c":  4},
+      "c": {"a": 42, "b": 12, "c": 99}})
+    self.assertTrue((counters_matrix == [[42, 12, 99],
+                                         [ 1,  0,  4],
+                                         [10,  8,  7]]).all())
+    self.assertListEqual(xlabels, ['a', 'b', 'c'])
+    self.assertListEqual(ylabels, ['c', 'b', 'a'])