Added Tab.SnapshotContent and MapsGL example to telemetry

tools/telemetry/telemetry/png_bitmap_unittest.py

Index: tools/telemetry/telemetry/png_bitmap_unittest.py
diff --git a/tools/telemetry/telemetry/png_bitmap_unittest.py b/tools/telemetry/telemetry/png_bitmap_unittest.py
new file mode 100644
index 0000000000000000000000000000000000000000..83fc4e0de03378e94d37a85916b154dc6928b6f6
--- /dev/null
+++ b/tools/telemetry/telemetry/png_bitmap_unittest.py
@@ -0,0 +1,27 @@
+# Copyright (c) 2012 The Chromium 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 unittest
+
+from telemetry import png_bitmap
+
+# This is a simple base64 encoded 2x2 PNG which contains, in order, a single
+# Red, Yellow, Blue, and Green pixel.
+test_png = """
+iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAIAAAD91
+JpzAAAAAXNSR0IArs4c6QAAAAlwSFlzAAALEwAACx
+MBAJqcGAAAABZJREFUCNdj/M/AwPCfgYGB4T/DfwY
+AHAAD/iOWZXsAAAAASUVORK5CYII=
+"""
+
+class PngBitmapTest(unittest.TestCase):
+  def testRead(self):
+    png = png_bitmap.PngBitmap(test_png)
+
+    self.assertEquals(2, png.width)
+    self.assertEquals(2, png.height)
+
+    self.assertTrue(png.GetPixelColor(0, 0).CheckRGB(255, 0, 0))
+    self.assertTrue(png.GetPixelColor(1, 1).CheckRGB(0, 255, 0))
+    self.assertTrue(png.GetPixelColor(0, 1).CheckRGB(0, 0, 255))
+    self.assertTrue(png.GetPixelColor(1, 0).CheckRGB(255, 255, 0))