Basic framework for devtools-based scrolling tests.

tools/chrome_remote_control/chrome_remote_control/tab.py

Index: tools/chrome_remote_control/chrome_remote_control/tab.py
diff --git a/tools/chrome_remote_control/chrome_remote_control/tab.py b/tools/chrome_remote_control/chrome_remote_control/tab.py
new file mode 100644
index 0000000000000000000000000000000000000000..cea0a54bb6b27c395984d43ca278b60ccf1ae6eb
--- /dev/null
+++ b/tools/chrome_remote_control/chrome_remote_control/tab.py
@@ -0,0 +1,90 @@
+# 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.
+import json
+import time
+import websocket
+import socket
+
+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 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"]
+
+class Tab(object):
+  def __init__(self, inspector_backend):
+    self._inspector_backend = inspector_backend
+    self.runtime = TabRuntime(self._inspector_backend)
+
+  def Close(self):
+    self._inspector_backend.Close()
+    self._inspector_backend = None
+
+  def __enter__(self):
+    return self
+
+  def __exit__(self, *args):
+    if self._inspector_backend:
+      self.Close()

[dtu, 2012/08/27 22:27:27]

Makes more sense in __del__, so it'll take effect for all instances, not just
those in with statements.

+
+  def BeginToLoadURL(self, url):
+    # In order to tell when the document has actually changed,
+    # we go to about:blank first and wait. When that has happened, we
+    # to go the new URL and detect the document being non-about:blank as
+    # indication that the new document is loading.
+    self.runtime.Evaluate("document.location = 'about:blank';")
+    while True:

[dtu, 2012/08/27 22:27:27]

while self.runtime.Evaluate("document.location.href") != "about:blank":

+      hr = self.runtime.Evaluate("document.location.href")
+      if hr == "about:blank":
+        break
+      time.sleep(0.01)
+
+    self.runtime.Evaluate("document.location = '%s';" % url)
+    while True:

[dtu, 2012/08/27 22:27:27]

while self.runtime.Evaluate("document.location.href") == "about:blank":

+      hr = self.runtime.Evaluate("document.location.href")
+      if hr != "about:blank":
+        break
+      time.sleep(0.01)
+
+  def WaitForDocumentReadyStateToBeComplete(self):
+    while True:

[dtu, 2012/08/27 22:27:27]

while self.runtime.Evaluate("document.readyState") != 'complete':

+      rs = self.runtime.Evaluate("document.readyState")
+      if rs == 'complete':
+        break
+      time.sleep(0.01)
+
+  def WaitForDocumentReadyStateToBeInteractiveOrBetter(self):
+    while True:
+      rs = self.runtime.Evaluate("document.readyState")
+      if rs == 'complete' or rs == 'interactive':
+        break
+      time.sleep(0.01)