[Telemetry] Implement automatic installation of optional openCV dependecy.

tools/telemetry/telemetry/core/platform/__init__.py

Index: tools/telemetry/telemetry/core/platform/__init__.py
diff --git a/tools/telemetry/telemetry/core/platform/__init__.py b/tools/telemetry/telemetry/core/platform/__init__.py
index 3622b607600bb0402e4400187838e8a0f52dd873..a8f701829a23c5d99c678b0aefb912277db220c7 100644
--- a/tools/telemetry/telemetry/core/platform/__init__.py
+++ b/tools/telemetry/telemetry/core/platform/__init__.py
@@ -222,6 +222,9 @@ class Platform(object):
     """Installs the given application."""
     return self._platform_backend.InstallApplication(application)
 
+  def InstallPythonModule(self, module):
+    return self._platform_backend.InstallPythonModule(module)
+
   def CanCaptureVideo(self):
     """Returns a bool indicating whether the platform supports video capture."""
     return self._platform_backend.CanCaptureVideo()