[Telemetry] Migrate bitmap.py from bitmaptools.cc to numpy

tools/telemetry/telemetry/core/video_unittest.py

Index: tools/telemetry/telemetry/core/video_unittest.py
diff --git a/tools/telemetry/telemetry/core/video_unittest.py b/tools/telemetry/telemetry/core/video_unittest.py
index aa4ddbe0c51d036aa0443debe21c3933a4601b48..9bbdafbafbb825690e618b33ddecb71934fbaca7 100644
--- a/tools/telemetry/telemetry/core/video_unittest.py
+++ b/tools/telemetry/telemetry/core/video_unittest.py
@@ -6,7 +6,6 @@ import logging
 import os
 import unittest
 
-from telemetry import benchmark
 from telemetry.core import bitmap
 from telemetry.core import platform
 from telemetry.core import util
@@ -15,7 +14,6 @@ from telemetry.core import video
 
 class VideoTest(unittest.TestCase) :
 
-  @benchmark.Disabled
   def testFramesFromMp4(self):
     host_platform = platform.GetHostPlatform()
 
@@ -45,6 +43,6 @@ class VideoTest(unittest.TestCase) :
     for i, timestamp_bitmap in enumerate(video_obj._FramesFromMp4(vid)):
       timestamp, bmp = timestamp_bitmap
       self.assertEquals(timestamp, expected_timestamps[i])
-      expected_bitmap = bitmap.Bitmap.FromPngFile(os.path.join(
+      expected_bitmap = bitmap.Bitmap.FromImageFile(os.path.join(
           util.GetUnittestDataDir(), 'frame%d.png' % i))
       self.assertTrue(expected_bitmap.IsEqual(bmp))