Make page_cycler.py fully measure memory for each page.

Telemetry makes the distinction between metrics collected for each page and for
each page set. The fine-grained memory metrics were collected only per page set
(although there was some histogram data collected per page).

This CL makes the memory metric module systematically report the whole data per
page (and not only per page set) so that we can measure pages independently.
The per page set memory metric collection is now a no-op.

BUG=323494

Review URL: https://codereview.chromium.org/91573003

git-svn-id: http://src.chromium.org/svn/trunk/src/build@239784 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

android/pylib/android_commands.py

@@ -25,8 +25,6 @@ import constants
 import screenshot
 import system_properties
 
-from utils import host_path_finder
-
 try:
   from pylib import pexpect
 except:
@@ -1501,20 +1499,6 @@ class AndroidCommands(object):
     logging.warning('Could not find disk IO stats.')
     return None
 
-  def PurgeUnpinnedAshmem(self):
-    """Purges the unpinned ashmem memory for the whole system.
-
-    This can be used to make memory measurements more stable in particular.
-    """
-    host_path = host_path_finder.GetMostRecentHostPath('purge_ashmem')
-    if not host_path:
-      raise Exception('Could not find the purge_ashmem binary.')
-    device_path = os.path.join(constants.TEST_EXECUTABLE_DIR, 'purge_ashmem')
-    self.PushIfNeeded(host_path, device_path)
-    if self.RunShellCommand(device_path, log_result=True):
-      return
-    raise Exception('Error while purging ashmem.')
-
   def GetMemoryUsageForPid(self, pid):
     """Returns the memory usage for given pid.