[android] Convert linker tests to platform mode.

build/android/pylib/linker/linker_test_instance.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.
+
+from pylib.base import test_instance
+from pylib.constants import host_paths
+from pylib.linker import test_case
+
+with host_paths.SysPath(host_paths.BUILD_COMMON_PATH):
+  import unittest_util
+
+_MODERN_LINKER_MINIMUM_SDK_INT = 23
+
+class LinkerTestInstance(test_instance.TestInstance):
+
+  def __init__(self, args):
+    super(LinkerTestInstance, self).__init__()
+    self._test_apk = args.test_apk
+    self._test_filter = args.test_filter
+
+  @property
+  def test_apk(self):
+    return self._test_apk
+
+  @property
+  def test_filter(self):
+    return self._test_filter
+
+  def GetTests(self, min_device_sdk):
+    tests = [
+      test_case.LinkerSharedRelroTest(is_modern_linker=False,
+                                      is_low_memory=False),
+      test_case.LinkerSharedRelroTest(is_modern_linker=False,
+                                      is_low_memory=True)
+    ]
+    if min_device_sdk >= _MODERN_LINKER_MINIMUM_SDK_INT:
+      tests.append(test_case.LinkerSharedRelroTest(is_modern_linker=True))
+
+    if self._test_filter:
+      filtered_names = unittest_util.FilterTestNames(
+          (t.qualified_name for t in tests), self._test_filter)
+      tests = [
+          t for t in tests
+          if t.qualified_name in filtered_names]
+
+    return tests
+
+  def SetUp(self):
+    pass
+
+  def TearDown(self):
+    pass
+
+  def TestType(self):
+    return 'linker'
+