[telemetry] Add util.path module and util.path.FindInstalledWindowsApplication.

tools/telemetry/telemetry/util/path.py

Index: tools/telemetry/telemetry/util/path.py
diff --git a/tools/telemetry/telemetry/util/path.py b/tools/telemetry/telemetry/util/path.py
new file mode 100644
index 0000000000000000000000000000000000000000..7feb861bdfba2c627cae5c062d998c5da32f7d29
--- /dev/null
+++ b/tools/telemetry/telemetry/util/path.py
@@ -0,0 +1,43 @@
+# 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.
+
+import os
+
+from telemetry.core import util
+
+
+# TODO(dtu): Move these functions from core.util to here.
+GetBaseDir = util.GetBaseDir
+GetTelemetryDir = util.GetTelemetryDir
+GetUnittestDataDir = util.GetUnittestDataDir
+GetChromiumSrcDir = util.GetChromiumSrcDir
+AddDirToPythonPath = util.AddDirToPythonPath
+GetBuildDirectories = util.GetBuildDirectories
+
+
+def IsExecutable(path):
+  return os.path.isfile(path) and os.access(path, os.X_OK)
+
+
+def FindInstalledWindowsApplication(application_path):
+  """Search common Windows installation directories for an application.
+
+  Args:
+    application_path: Path to application relative from installation location.
+  Returns:
+    A string representing the full path, or None if not found.
+  """
+  search_paths = [os.getenv('PROGRAMFILES(X86)'),
+                  os.getenv('PROGRAMFILES'),
+                  os.getenv('LOCALAPPDATA')]
+  search_paths += os.getenv('PATH', '').split(os.pathsep)
+
+  for search_path in search_paths:
+    if not search_path:
+      continue
+    path = os.path.join(search_path, application_path)
+    if IsExecutable(path):
+      return path
+
+  return None