[Telemetry] Move WPR life cycle from browser to platform

tools/telemetry/telemetry/testing/fakes/__init__.py

Index: tools/telemetry/telemetry/testing/fakes/__init__.py
diff --git a/tools/telemetry/telemetry/testing/fakes/__init__.py b/tools/telemetry/telemetry/testing/fakes/__init__.py
index 2cbfc385fb70f7acfac0ec1150c17d46f4b45d62..a95088a5e50f0604408cfe65da3b2c135e9beabc 100644
--- a/tools/telemetry/telemetry/testing/fakes/__init__.py
+++ b/tools/telemetry/telemetry/testing/fakes/__init__.py
@@ -23,13 +23,18 @@ from telemetry.testing.internal import fake_gpu_info
 # fakes API.
 
 class FakePlatform(object):
+  def __init__(self):
+    self._network_controller = None
+
   @property
   def is_host_platform(self):
     raise NotImplementedError
 
   @property
   def network_controller(self):
-    return _FakeNetworkController()
+    if self._network_controller is None:
+      self._network_controller = _FakeNetworkController()
+    return self._network_controller
 
   @property
   def tracing_controller(self):
@@ -250,12 +255,21 @@ class _FakeCredentials(object):
 
 
 class _FakeNetworkController(object):
-  def SetReplayArgs(self, *args, **kwargs):
+  def __init__(self):
+    self.wpr_mode = None
+
+  def Open(self, wpr_mode, *args, **kwargs):
+    self.wpr_mode = wpr_mode
+
+  def StartReplay(self, *args, **kwargs):
     pass
 
-  def UpdateReplayForExistingBrowser(self):
+  def StopReplay(self):
     pass
 
+  def Close(self):
+    self.wpr_mode = None
+
 
 class _FakeTab(object):
   def __init__(self, browser, tab_id):