[telemetry] Implement per-pixel algorithms in Bitmap as a C++ extension.

tools/telemetry/telemetry/core/bitmaptools/__init__.py

Index: tools/telemetry/telemetry/core/bitmaptools/__init__.py
diff --git a/tools/telemetry/telemetry/core/bitmaptools/__init__.py b/tools/telemetry/telemetry/core/bitmaptools/__init__.py
new file mode 100644
index 0000000000000000000000000000000000000000..e6bb7a8a49a4b93d08079a0eedffa953b10dd633
--- /dev/null
+++ b/tools/telemetry/telemetry/core/bitmaptools/__init__.py
@@ -0,0 +1,38 @@
+# Copyright 2014 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.
+
+""" Bitmap processing routines.
+
+All functions accept a tuple of (pixels, width, channels) as the first argument.
+Bounding box is a tuple (left, right, width, height).
+"""
+
+import imp
+import os
+import sys
+
+from telemetry.core import build_extension, util
+
+
+def _BuildModule(module_name):
+  # Build the extension for telemetry users who don't use all.gyp.
+  path = os.path.dirname(__file__)
+  src_files = [os.path.join(path, 'bitmaptools.cc')]
+  build_extension.BuildExtension(src_files, path, module_name)
+  return imp.find_module(module_name, [path])
+
+
+def _FindAndImport():
+  found = util.FindSupportModule('bitmaptools')
+  if not found:
+    found = _BuildModule('bitmaptools')
+  if not found:
+    raise NotImplementedError('The bitmaptools module is not available.')
+  return imp.load_module('bitmaptools', *found)
+
+
+sys.modules['bitmaptools_ext'] = _FindAndImport()
+
+# pylint: disable=W0401,F0401
+from bitmaptools_ext import *