Add methods for cache_temperature: ClearCache, WarmCache

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 36 matching lines @@
     if exception_type:
       return True
 
     marker = 'telemetry.internal.%s.end' % self.identifier
     self.browser.tabs[0].ExecuteJavaScript(
         "console.time({{ marker }});", marker=marker)
     self.browser.tabs[0].ExecuteJavaScript(
         "console.timeEnd({{ marker }});", marker=marker)
     return True
 
+def ClearCache(browser):
+  tab = browser.tabs[0]
+  tab.ClearCache(force=True)
+
+def WarmCache(page, browser):
+  with MarkTelemetryInternal(browser, 'warm_cache'):
+    tab = browser.tabs[0]
+    tab.Navigate(page.url)
+    py_utils.WaitFor(tab.HasReachedQuiescence, 60)
+    tab.WaitForDocumentReadyStateToBeComplete()
+    tab.Navigate("about:blank")
+    tab.WaitForDocumentReadyStateToBeComplete()
+
 def EnsurePageCacheTemperature(page, browser, previous_page=None):
   temperature = page.cache_temperature
   logging.info('PageCacheTemperature: %s', temperature)
-
   if temperature == ANY:
     return
-
   if temperature == COLD:
     if previous_page is None:
       # DiskCache initialization is performed asynchronously on Chrome start-up.
       # Ensure that DiskCache is initialized before starting the measurement to
       # avoid performance skew.
       # This is done by navigating to an inexistent URL and then wait for the
       # navigation to complete.
       # TODO(kouhei) Consider moving this logic to PageCyclerStory
       with MarkTelemetryInternal(browser, 'ensure_diskcache'):
         tab = browser.tabs[0]
         tab.Navigate("http://does.not.exist")
         tab.WaitForDocumentReadyStateToBeComplete()
-    any_tab = browser.tabs[0]
-    any_tab.ClearCache(force=True)
+    ClearCache(browser)
   elif temperature == WARM:
     if (previous_page is not None and
         previous_page.url == page.url and
         (previous_page.cache_temperature == COLD or
          previous_page.cache_temperature == 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, 'warm_cache'):
-      tab = browser.tabs[0]
-      tab.Navigate(page.url)
-      py_utils.WaitFor(tab.HasReachedQuiescence, 60)
-      tab.WaitForDocumentReadyStateToBeComplete()
-      tab.Navigate("about:blank")
-      tab.WaitForDocumentReadyStateToBeComplete()
+    WarmCache(page, browser)