Added Tab.SnapshotContent and MapsGL example to telemetry

tools/telemetry/telemetry/tab.py

 # 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.
 from telemetry import inspector_console
 from telemetry import inspector_page
 from telemetry import inspector_runtime
 from telemetry import inspector_timeline
 from telemetry import util
 
 DEFAULT_TAB_TIMEOUT = 60
 
 class Tab(object):
   """Represents a tab in the browser
 
   The important parts of the Tab object are in the runtime and page objects.
   E.g.:
       # Navigates the tab to a given url.
       tab.page.Navigate('http://www.google.com/')
 
       # Evaluates 1+1 in the tab's javascript context.
       tab.runtime.Evaluate('1+1')
   """
   def __init__(self, browser, inspector_backend):
     self._browser = browser
     self._inspector_backend = inspector_backend
-    self._page = inspector_page.InspectorPage(self._inspector_backend)
-    self._runtime = inspector_runtime.InspectorRuntime(self._inspector_backend)
-    self._console = inspector_console.InspectorConsole(self._inspector_backend)
+    self._page = inspector_page.InspectorPage(self._inspector_backend, self)
+    self._runtime = inspector_runtime.InspectorRuntime(
+        self._inspector_backend, self)
+    self._console = inspector_console.InspectorConsole(
+        self._inspector_backend, self)
     self._timeline = inspector_timeline.InspectorTimeline(
-        self._inspector_backend)
+        self._inspector_backend, self)
 
   def __del__(self):
     self.Close()
 
   def Close(self):
     self._console = None
     self._runtime = None
     self._page = None
     self._timeline = None
     if self._inspector_backend:
@@ skipping 36 matching lines @@
     util.WaitFor(
         lambda: self._runtime.Evaluate('document.readyState') == 'complete',
         timeout)
 
   def WaitForDocumentReadyStateToBeInteractiveOrBetter(
       self, timeout=DEFAULT_TAB_TIMEOUT):
     def IsReadyStateInteractiveOrBetter():
       rs = self._runtime.Evaluate('document.readyState')
       return rs == 'complete' or rs == 'interactive'
     util.WaitFor(IsReadyStateInteractiveOrBetter, timeout)