Basic framework for devtools-based scrolling tests.

tools/chrome_remote_control/chrome_remote_control/tab_runtime.py

Index: tools/chrome_remote_control/chrome_remote_control/tab_runtime.py
diff --git a/tools/chrome_remote_control/chrome_remote_control/tab_runtime.py b/tools/chrome_remote_control/chrome_remote_control/tab_runtime.py
new file mode 100644
index 0000000000000000000000000000000000000000..c78b123d1cf41d55a4ae38a786edb0c84798b176
--- /dev/null
+++ b/tools/chrome_remote_control/chrome_remote_control/tab_runtime.py
@@ -0,0 +1,41 @@
+# Copyright (c) 2012 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+class EvaluateException(Exception):
+  pass
+
+class TabRuntime(object):
+  def __init__(self, inspector_backend):
+    self._inspector_backend = inspector_backend
+    self._inspector_backend.RegisterDomain(
+        'Runtime',
+        self._OnNotification,
+        self._OnClose)
+
+  def _OnNotification(self, msg):
+    pass
+
+  def _OnClose(self):
+    pass
+
+  def Evaluate(self, expr):
+    request = {
+      "method": "Runtime.evaluate",
+      "params": {
+        "expression": expr,
+        "returnByValue": True
+        }
+      }
+    res = self._inspector_backend.SyncRequest(request)
+    if "error" in res:
+      raise EvaluateException(res["error"]["message"])
+
+    if res["result"]["wasThrown"]:
+      # TODO(nduca): propagate stacks from javascript up to the python
+      # exception.
+      raise EvaluateException(res["result"]["result"]["description"])
+    if res["result"]["result"]["type"] == 'undefined':
+      return None
+    return res["result"]["result"]["value"]
+