add chrome specific setting to CtsRootDeviceSetup

- This disables chrome's initial screen:
  Manual setting is required for user rom.

Change-Id: Ic622767f29e6cf0692bc032b47996dc6c59d1162
diff --git a/tools/tradefed-host/src/com/android/cts/tradefed/targetprep/CtsRootDeviceSetup.java b/tools/tradefed-host/src/com/android/cts/tradefed/targetprep/CtsRootDeviceSetup.java
index 09129ca..0e768e2 100644
--- a/tools/tradefed-host/src/com/android/cts/tradefed/targetprep/CtsRootDeviceSetup.java
+++ b/tools/tradefed-host/src/com/android/cts/tradefed/targetprep/CtsRootDeviceSetup.java
@@ -66,7 +66,10 @@
             // perform CTS setup steps that only work if adb is root
             SettingsToggler.setSecureInt(device, "mock_location", 1);
             enableDeviceAdmin(device, buildHelper);
-
+            // This is chrome specific setting to disable the first screen.
+            // For other browser, it will not do anything.
+            device.executeShellCommand(
+                    "echo \"chrome --disable-fre\" > /data/local/chrome-command-line");
             // end root setup steps
         } catch (FileNotFoundException e) {
             throw new TargetSetupError("Invalid CTS installation", e);