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

tools/telemetry/telemetry/core/util.py

Index: tools/telemetry/telemetry/core/util.py
diff --git a/tools/telemetry/telemetry/core/util.py b/tools/telemetry/telemetry/core/util.py
index be8212e659351dfc9cb2a125e4471ef5d36f013d..28912212ff42631729d7a82683d795784b8ad34d 100644
--- a/tools/telemetry/telemetry/core/util.py
+++ b/tools/telemetry/telemetry/core/util.py
@@ -1,6 +1,7 @@
 # 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 imp
 import inspect
 import logging
 import os
@@ -145,6 +146,7 @@ def GetBuildDirectories():
     for build_type in build_types:
       yield build_dir, build_type
 
+
 def FindSupportBinary(binary_name, executable=True):
   """Returns the path to the given binary name."""
   # TODO(tonyg/dtu): This should support finding binaries in cloud storage.
@@ -164,3 +166,23 @@ def FindSupportBinary(binary_name, executable=True):
         command_mtime = candidate_mtime
 
   return command
+
+
+def FindSupportModule(module_name):
+  """Like FindSupportBinary but uses imp.find_module to find a Python module."""
+  module = None
+  module_mtime = 0
+
+  chrome_root = GetChromiumSrcDir()
+  for build_dir, build_type in GetBuildDirectories():
+    path = os.path.join(chrome_root, build_dir, build_type)
+    try:
+      candidate = imp.find_module(module_name, [path])
+    except ImportError:
+      continue
+    candidate_mtime = os.stat(candidate[1]).st_mtime
+    if candidate_mtime > module_mtime:
+      module = candidate
+      module_mtime = candidate_mtime
+
+  return module