android: Make org.chromium.base.SysUtils.isLowEndDevice() work without native code.

build/android/pylib/linker/test_case.py

 # Copyright 2013 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.
 
 """Base class for linker-specific test cases.
 
    The custom dynamic linker can only be tested through a custom test case
    for various technical reasons:
 
      - It's an 'invisible feature', i.e. it doesn't expose a new API or
@@ skipping 536 matching lines @@
       # Note that this behaviour doesn't seem to happen when starting an
       # application 'normally', i.e. when using the application launcher to
       # start the activity.
       logging.info('Ignoring system\'s low randomization of browser libraries' +
                    ' for regular devices')
 
     if not renderer_status:
       return ResultType.FAIL, renderer_logs
 
     return ResultType.PASS, logs
-
-
-class LinkerLowMemoryThresholdTest(LinkerTestCaseBase):
-  """This test checks that the definitions for the low-memory device physical
-     RAM threshold are identical in the base/ and linker sources. Because these
-     two components should absolutely not depend on each other, it's difficult
-     to perform this check correctly at runtime inside the linker test binary
-     without introducing hairy dependency issues in the build, or complicated
-     plumbing at runtime.
-
-     To work-around this, this test looks directly into the sources for a
-     definition of the same constant that should look like:
-
-       #define ANDROID_LOW_MEMORY_DEVICE_THRESHOLD_MB  <number>
-
-     And will check that the values for <number> are identical in all of
-     them."""
-
-  # A regular expression used to find the definition of the threshold in all
-  # sources:
-  _RE_THRESHOLD_DEFINITION = re.compile(
-      r'^\s*#\s*define\s+ANDROID_LOW_MEMORY_DEVICE_THRESHOLD_MB\s+(\d+)\s*$',
-      re.MULTILINE)
-
-  # The list of source files, relative to DIR_SOURCE_ROOT, which must contain
-  # a line that matches the re above.
-  _SOURCES_LIST = [
-      'base/android/sys_utils.cc',
-      'content/common/android/linker/linker_jni.cc' ]
-
-  def _RunTest(self, adb):
-    failure = False
-    values = []
-    # First, collect all the values in all input sources.
-    re = LinkerLowMemoryThresholdTest._RE_THRESHOLD_DEFINITION
-    for source in LinkerLowMemoryThresholdTest._SOURCES_LIST:
-      source_path = os.path.join(constants.DIR_SOURCE_ROOT, source);
-      if not os.path.exists(source_path):
-        logging.error('Missing source file: ' + source_path)
-        failure = True
-        continue
-      with open(source_path) as f:
-        source_text = f.read()
-        # For some reason, re.match() never works here.
-        source_values = re.findall(source_text)
-        if not source_values:
-          logging.error('Missing low-memory threshold definition in ' + \
-                        source_path)
-          logging.error('Source:\n%s\n' % source_text)
-          failure = True
-          continue
-        values += source_values
-
-    # Second, check that they are all the same.
-    if not failure:
-      for value in values[1:]:
-        if value != values[0]:
-          logging.error('Value mismatch: ' + repr(values))
-          failure = True
-
-    if failure:
-      return ResultType.FAIL, 'Incorrect low-end memory threshold definitions!'
-
-    return ResultType.PASS, ''