[Telemetry] Move supports_tab_control to PossibleBrowser.

tools/telemetry/telemetry/core/possible_browser.py

Index: tools/telemetry/telemetry/core/possible_browser.py
diff --git a/tools/telemetry/telemetry/core/possible_browser.py b/tools/telemetry/telemetry/core/possible_browser.py
index 21d51e8b98b8b4360c5b619d2bcd2247f8d8488e..cd1403327033862eddfc65460fcbd3855b2296e2 100644
--- a/tools/telemetry/telemetry/core/possible_browser.py
+++ b/tools/telemetry/telemetry/core/possible_browser.py
@@ -11,10 +11,12 @@ class PossibleBrowser(object):
   Call Create() to launch the browser and begin manipulating it..
   """
 
-  def __init__(self, browser_type, target_os, finder_options):
+  def __init__(self, browser_type, target_os, finder_options,
+               supports_tab_control):
     self._browser_type = browser_type
     self._target_os = target_os
     self._finder_options = finder_options
+    self._supports_tab_control = supports_tab_control
     self._platform = None
 
   def __repr__(self):
@@ -34,6 +36,10 @@ class PossibleBrowser(object):
     return self._finder_options
 
   @property
+  def supports_tab_control(self):
+    return self._supports_tab_control
+
+  @property
   def platform(self):
     if not self._platform:
       self._platform = platform.Platform(self._platform_backend)