Make credential_path a page attribute instead of page_set attribute.

tools/telemetry/telemetry/core/util_unittest.py

Index: tools/telemetry/telemetry/core/util_unittest.py
diff --git a/tools/telemetry/telemetry/core/util_unittest.py b/tools/telemetry/telemetry/core/util_unittest.py
index 15a1aaff4a40c7d39a05bc38dc1c93996d0cc4de..a48aef0a30c36f0e87827eca844699e3799af0ab 100644
--- a/tools/telemetry/telemetry/core/util_unittest.py
+++ b/tools/telemetry/telemetry/core/util_unittest.py
@@ -62,3 +62,36 @@ class TestGetSequentialFileName(unittest.TestCase):
 
   def tearDown(self):
     shutil.rmtree(self.test_directory)
+
+
+class TestGetAbsPathIfExists(unittest.TestCase):
+  def setUp(self):
+    self.test_directory = tempfile.mkdtemp()
+    self.test_abs_path = tempfile.mkstemp(dir=self.test_directory)[1]
+
+  def testTestGetAbsPathIfExistsWithExistedAbsPathInput(self):
+    self.assertEquals(
+        self.test_abs_path, util.GetAbsPathIfExist(
+            self.test_abs_path, self.test_directory))
+
+  def testTestGetAbsPathIfExistsWithExistedRelativePathInput(self):
+    # Case path = foo and relative path = /tmp/xyz/
+    # (The actual naming maybe different)
+    path = os.path.basename(self.test_abs_path)
+    relative_path = self.test_directory
+    self.assertEquals(
+        self.test_abs_path, util.GetAbsPathIfExist(path, relative_path))
+    # Case path = xyz/foo and relative path = /tmp/
+    # (The actual naming maybe different)
+    path = os.path.join(os.path.basename(self.test_directory),
+                        os.path.basename(self.test_abs_path))
+    relative_path = os.path.join(self.test_directory, os.pardir)
+    self.assertEquals(
+        self.test_abs_path, util.GetAbsPathIfExist(path, relative_path))
+
+  def testTestGetAbsPathIfExistsWithNonExistedPathInput(self):
+    self.assertIsNone(util.GetAbsPathIfExist('foo', self.test_directory))
+    self.assertIsNone(util.GetAbsPathIfExist('foo/bar', self.test_directory))
+
+  def tearDown(self):
+    shutil.rmtree(self.test_directory)