[telemetry] Always use a dynamic device port on android. (RELAND)

telemetry/telemetry/internal/platform/android_platform_backend.py

Index: telemetry/telemetry/internal/platform/android_platform_backend.py
diff --git a/telemetry/telemetry/internal/platform/android_platform_backend.py b/telemetry/telemetry/internal/platform/android_platform_backend.py
index 88598db9fc2415e26e466396a37853c5d42ff9f8..e5a73570bd0a6a0a217cadd973b4c3c8ad33f063 100644
--- a/telemetry/telemetry/internal/platform/android_platform_backend.py
+++ b/telemetry/telemetry/internal/platform/android_platform_backend.py
@@ -44,6 +44,12 @@ from devil.android.sdk import version_codes
 from devil.android.tools import video_recorder
 
 try:
+  # devil.android.forwarder uses fcntl, which doesn't exist on Windows.
+  from devil.android import forwarder
+except ImportError:
+  forwarder = None
+
+try:
   from devil.android.perf import surface_stats_collector
 except Exception:
   surface_stats_collector = None
@@ -158,6 +164,9 @@ class AndroidPlatformBackend(
     else:
       return False
 
+  def GetRemotePort(self, port):
+    return forwarder.Forwarder.DevicePortForHostPort(port) or 0
+
   def IsDisplayTracingSupported(self):
     return bool(self.GetOSVersionName() >= 'J')