Telemetry: extends Platform abstraction.

tools/telemetry/telemetry/possible_browser.py

Index: tools/telemetry/telemetry/possible_browser.py
diff --git a/tools/telemetry/telemetry/possible_browser.py b/tools/telemetry/telemetry/possible_browser.py
index 2cb995fea58d416c5002418779a72578260c501b..e196ffc1b452ab932bdc863c842d70ce6dfff67b 100644
--- a/tools/telemetry/telemetry/possible_browser.py
+++ b/tools/telemetry/telemetry/possible_browser.py
@@ -20,3 +20,14 @@ class PossibleBrowser(object):
 
   def Create(self):
     raise NotImplementedError()
+
+  def CreatePlatformHarness(self):
+    """Returns an object responsible for setup / tear down."""
+    class EmptyPlatforHarness(object):
+      def __enter__(self):
+        return self
+
+      def __exit__(self, *args):
+        pass
+
+    return EmptyPlatforHarness()