[telemetry] Add support for requesting memory dumps via DevTools API

tools/telemetry/telemetry/internal/browser/browser.py

 # Copyright 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 os
 
 from telemetry.core import exceptions
 from telemetry.core import local_server
 from telemetry.core import memory_cache_http_server
 from telemetry.core import profiling_controller
 from telemetry import decorators
 from telemetry.internal import app
 from telemetry.internal.backends import browser_backend
 from telemetry.internal.browser import browser_credentials
 from telemetry.internal.browser import extension_dict
 from telemetry.internal.browser import tab_list
+from telemetry.internal.browser import web_contents
 
 
 class Browser(app.App):
   """A running browser instance that can be controlled in a limited way.
 
   To create a browser instance, use browser_finder.FindBrowser.
 
   Be sure to clean up after yourself by calling Close() when you are done with
   the browser. Or better yet:
     browser_to_create = FindBrowser(options)
@@ skipping 247 matching lines @@
 
   @property
   def supports_system_info(self):
     return self._browser_backend.supports_system_info
 
   def GetSystemInfo(self):
     """Returns low-level information about the system, if available.
 
        See the documentation of the SystemInfo class for more details."""
     return self._browser_backend.GetSystemInfo()
+
+  @property
+  def supports_memory_dumping(self):
+    return self._browser_backend.supports_memory_dumping
+
+  def DumpMemory(self, timeout=web_contents.DEFAULT_WEB_CONTENTS_TIMEOUT):
+    return self._browser_backend.DumpMemory(timeout)