Expose GPU information to Telemetry.

tools/telemetry/telemetry/core/backends/browser_backend.py

Index: tools/telemetry/telemetry/core/backends/browser_backend.py
diff --git a/tools/telemetry/telemetry/core/backends/browser_backend.py b/tools/telemetry/telemetry/core/backends/browser_backend.py
index bb120bd34e8e69d83b6428651f07b64b66d4a7c6..521b949c7432ac3abbf2c0e8d1f152b9b28fcd60 100644
--- a/tools/telemetry/telemetry/core/backends/browser_backend.py
+++ b/tools/telemetry/telemetry/core/backends/browser_backend.py
@@ -55,6 +55,10 @@ class BrowserBackend(object):
   def supports_tracing(self):
     raise NotImplementedError()
 
+  @property
+  def supports_system_info(self):
+    return False
+
   def StartTracing(self, custom_categories=None,
                    timeout=web_contents.DEFAULT_WEB_CONTENTS_TIMEOUT):
     raise NotImplementedError()
@@ -83,6 +87,9 @@ class BrowserBackend(object):
   def GetStackTrace(self):
     raise NotImplementedError()
 
+  def GetSystemInfo(self):
+    raise NotImplementedError()
+
 class DoNothingForwarder(object):
   def __init__(self, *port_pairs):
     self._host_port = port_pairs[0].local_port