[Telemetry] Implement automatic installation of optional openCV dependecy.

tools/telemetry/telemetry/util/support_binaries.py

 # 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
 import stat
 
 from telemetry import decorators
 from telemetry.util import cloud_storage
 from telemetry.util import path
 
 
 def _GetBinPath(binary_name, arch_name, platform_name):
   return os.path.join(
       path.GetTelemetryDir(), 'bin', platform_name, arch_name, binary_name)
 
 
 def _IsInCloudStorage(binary_name, arch_name, platform_name):
   return os.path.exists(
       _GetBinPath(binary_name, arch_name, platform_name) + '.sha1')
 
 
 @decorators.Cache
 def FindLocallyBuiltPath(binary_name):
   """Finds the most recently built |binary_name|."""
   command = None
   command_mtime = 0
   chrome_root = path.GetChromiumSrcDir()
   required_mode = os.X_OK
-  if binary_name.endswith('.apk'):
+  if binary_name.endswith('.apk') or binary_name.endswith('.so'):
     required_mode = os.R_OK
   for build_dir, build_type in path.GetBuildDirectories():
     candidate = os.path.join(chrome_root, build_dir, build_type, binary_name)
     if os.path.isfile(candidate) and os.access(candidate, required_mode):
       candidate_mtime = os.stat(candidate).st_mtime
       if candidate_mtime > command_mtime:
         command = candidate
         command_mtime = candidate_mtime
   return command
 
@@ skipping 12 matching lines @@
 
     # Ensure the downloaded file is actually executable.
     if command and os.path.exists(command):
       os.chmod(command,
                stat.S_IRUSR | stat.S_IWUSR | stat.S_IXUSR | stat.S_IRGRP)
 
   # Return an absolute path consistently.
   if command:
     command = os.path.abspath(command)
   return command