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
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index 0000000000000000000000000000000000000000..e7863d8c6b323ea2a1c053a6a46000543d61afc7
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+++ b/tools/chrome_remote_control/chrome_remote_control/tab.py
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+# 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
+
+import tab_runtime
+
+class Tab(object):
+  def __init__(self, inspector_backend):
+    self._inspector_backend = inspector_backend
+    self.runtime = tab_runtime.TabRuntime(self._inspector_backend)
+
+  def __del__(self):
+    self.Close()
+
+  def Close(self):
+    if self._inspector_backend:
+      self._inspector_backend.Close()
+      self._inspector_backend = None
+
+  def __enter__(self):
+    return self
+
+  def __exit__(self, *args):
+    self.Close()
+
+  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 self.runtime.Evaluate("document.location.href") != "about:blank":
+      time.sleep(0.01)
+
+    self.runtime.Evaluate("document.location = '%s';" % url)
+    while self.runtime.Evaluate("document.location.href") == "about:blank":
+      time.sleep(0.01)
+
+  def WaitForDocumentReadyStateToBeComplete(self):
+    while self.runtime.Evaluate("document.readyState") != 'complete':
+      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)