Reland r212020: Move Python setup/tear down logic into Forwarder ...

tools/telemetry/telemetry/core/chrome/adb_commands.py

Index: tools/telemetry/telemetry/core/chrome/adb_commands.py
diff --git a/tools/telemetry/telemetry/core/chrome/adb_commands.py b/tools/telemetry/telemetry/core/chrome/adb_commands.py
index e18e667d35717f5dc74cd69fd0437758c1b1d269..890327bf19eb273a4c97d9f590b86ae327c0907f 100644
--- a/tools/telemetry/telemetry/core/chrome/adb_commands.py
+++ b/tools/telemetry/telemetry/core/chrome/adb_commands.py
@@ -20,7 +20,6 @@ try:
   from pylib import cmd_helper # pylint: disable=F0401
   from pylib import forwarder # pylint: disable=F0401
   from pylib import ports # pylint: disable=F0401
-  from pylib import valgrind_tools # pylint: disable=F0401
 except Exception:
   android_commands = None
 
@@ -160,34 +159,24 @@ def HasForwarder(buildtype=None):
 
 class Forwarder(object):
   def __init__(self, adb, *port_pairs):
-    tool = valgrind_tools.BaseTool()
+    self._adb = adb.Adb()
     self._host_port = port_pairs[0].local_port
 
     new_port_pairs = [(port_pair.local_port, port_pair.remote_port)
                       for port_pair in port_pairs]
 
-    self._forwarder = forwarder.Forwarder(adb.Adb(), Forwarder._GetBuildType())
-    self._forwarder.Run(new_port_pairs, tool)
+    self._port_pairs = new_port_pairs
+    forwarder.Forwarder.Map(new_port_pairs, self._adb)
 
   @staticmethod
   def _GetBuildType():
     assert HasForwarder()
     return 'Debug' if HasForwarder('Debug') else 'Release'
 
-  @staticmethod
-  def KillHost():
-    forwarder.Forwarder.KillHost(Forwarder._GetBuildType())
-
-  @staticmethod
-  def KillDevice(adb):
-    forwarder.Forwarder.KillDevice(adb.Adb(), valgrind_tools.BaseTool())
-
   @property
   def url(self):
-    assert self._forwarder
     return 'http://localhost:%i' % self._host_port
 
   def Close(self):
-    if self._forwarder:
-      self._forwarder.Close()
-      self._forwarder = None
+    for (device_port, _) in self._port_pairs:
+      forwarder.Forwarder.UnmapDevicePort(device_port, self._adb)