[polymer] Merge of master into polymer10-migration

telemetry/telemetry/page/cache_temperature.py

 # Copyright 2016 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.
 
 """
 Cache temperature specifies how the browser cache should be configured before
 the page run.
 
 See design doc for details:
 https://docs.google.com/document/u/1/d/12D7tkhZi887g9d0U2askU9JypU_wYiEI7Lw0bfwxUgA
@@ skipping 53 matching lines @@
         tab.Navigate("http://does.not.exist")
         tab.WaitForDocumentReadyStateToBeComplete()
 
     any_tab = browser.tabs[0]
     any_tab.ClearCache(force=True)
   elif temperature == PCV1_WARM:
     if (previous_page is not None and
         previous_page.url == page.url and
         (previous_page.cache_temperature == PCV1_COLD or
             previous_page.cache_temperature == PCV1_WARM)):
+      if '#' in page.url:
+        # Navigate to inexistent URL to avoid in-page hash navigation.
+        # Note: Unlike PCv1, PCv2 iterates the same URL for different cache
+        #       configurations. This may issue blink in-page hash navigations,
+        #       which isn't intended here.
+        with MarkTelemetryInternal(browser, 'avoid_double_hash_navigation'):
+          tab = browser.tabs[0]
+          tab.Navigate("http://does.not.exist")
+          tab.WaitForDocumentReadyStateToBeComplete()
       return
 
     with MarkTelemetryInternal(browser, 'warmCache'):
       tab = browser.tabs[0]
       tab.Navigate(page.url)
       util.WaitFor(tab.HasReachedQuiescence, 60)
       tab.WaitForDocumentReadyStateToBeComplete()
       tab.Navigate("about:blank")
       tab.WaitForDocumentReadyStateToBeComplete()