tests: Added skip messages to tests

Went through all the tests in layer_validation_tests and added skip
messages to all tests that conditionally skip their checks.
Additionally, added the prefix "TEST_SKIPPED" to all the skip messages
so that they can easily be parsed.

Also added a script that looks parses the output of all the tests and
prints a short summary of which tests were skipped on every device
profile and which tests print unexpected output.
diff --git a/scripts/parse_test_results.py b/scripts/parse_test_results.py
new file mode 100644
index 0000000..2f996f0
--- /dev/null
+++ b/scripts/parse_test_results.py
@@ -0,0 +1,173 @@
+#!/usr/bin/python3
+#
+# Copyright (c) 2018 Google Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#           http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# Author: William Henning <whenning@google.com>
+#
+# This script parses the validation layers test continuous integration ouput
+# and reports the number of tests that passed, failured, ouput unexpected errors,
+# or were skipped. As such, the script is only designed to parse the ouput
+# generated by the existing CI implementation.
+#
+# usage:
+#       for profile in tests/device_profiles/*.json; do echo Testing with
+#       profile $profile; VK_LAYER_PATH=DEVSIM_AND_VALIDATION_PATHS
+#       VK_DEVSIM_FILE=$profile VK_ICD_FILENAMES=MOCK_ICD_PATH
+#       ./build/tests/vk_layer_validation_tests --devsim; done
+#       | python3 parse_test_results.py [--fail_on_skip] [--fail_on_unexpected]
+#
+#       --fail_on_skip causes the script to exit with a non-zero exit code if a test
+#       didn't run on any device profile
+#
+#       --fail_on_unexpected causes the script to exit with a non-zero exit code if
+#       a test printed unexpected errors
+#
+
+import argparse
+import re
+import sys
+from collections import defaultdict
+
+class OutputStats(object):
+    def __init__(self):
+        self.current_profile = ""
+        self.current_test = ""
+        self.current_test_output = ""
+        self.test_results = defaultdict(defaultdict)
+        self.unexpected_errors = defaultdict(defaultdict)
+
+    def match(self, line):
+        self.new_profile_match(line)
+        self.test_suite_end_match(line)
+        self.start_test_match(line)
+        if self.current_test != "":
+            self.current_test_output += line
+        self.skip_test_match(line)
+        self.pass_test_match(line)
+        self.fail_test_match(line)
+        self.unexpected_error_match(line)
+
+    def print_summary(self, skip_is_failure, unexpected_is_failure):
+        if self.current_test != "":
+            self.test_died()
+
+        passed_tests = 0
+        skipped_tests = 0
+        failed_tests = 0
+        unexpected_error_tests = 0
+        did_fail = False
+
+        for test_name, results in self.test_results.items():
+            skipped_profiles = 0
+            passed_profiles = 0
+            failed_profiles = 0
+            aborted_profiles = 0
+            unexpected_error_profiles = 0
+            for profile, result in results.items():
+                if result == "pass":
+                    passed_profiles += 1
+                if result == "fail":
+                    failed_profiles += 1
+                if result == "skip":
+                    skipped_profiles += 1
+                if self.unexpected_errors.get(test_name, {}).get(profile, "") == "true":
+                    unexpected_error_profiles += 1
+            if failed_profiles != 0:
+                print("TEST FAILED:", test_name)
+                failed_tests += 1
+            elif skipped_profiles == len(results):
+                print("TEST SKIPPED ALL DEVICES:", test_name)
+                skipped_tests += 1
+            else:
+                passed_tests += 1
+            if unexpected_error_profiles != 0:
+                print("UNEXPECTED ERRORS:", test_name)
+                unexpected_error_tests += 1
+        num_tests = len(self.test_results)
+        print("PASSED: ", passed_tests, "/", num_tests, " tests")
+        if skipped_tests != 0:
+            did_fail |= skip_is_failure
+            print("NEVER RAN: ", skipped_tests, "/", num_tests, " tests")
+        if failed_tests != 0:
+            did_fail = True
+            print("FAILED: ", failed_tests, "/", num_tests, "tests")
+        if unexpected_error_tests != 0:
+            did_fail |= unexpected_is_failure
+            print("UNEXPECTED OUPUT: ", unexpected_error_tests, "/", num_tests, "tests")
+        return did_fail
+
+    def new_profile_match(self, line):
+        if re.search(r'Testing with profile .*/(.*)', line) != None:
+            self.current_profile = re.search(r'Testing with profile .*/(.*)', line).group(1)
+
+    def test_suite_end_match(self, line):
+        if re.search(r'\[-*\]', line) != None:
+            if self.current_test != "":
+                # Here we see a message that starts [----------] before another test
+                # finished running. This should mean that that other test died.
+                self.test_died()
+
+    def start_test_match(self, line):
+        if re.search(r'\[ RUN\s*\]', line) != None:
+            # This parser doesn't handle the case where one test's start comes between another
+            # test's start and result.
+            assert self.current_test == ""
+            self.current_test = re.search(r'] (.*)', line).group(1)
+            self.current_test_output = ""
+
+    def skip_test_match(self, line):
+        if re.search(r'TEST_SKIPPED', line) != None:
+            self.test_results[self.current_test][self.current_profile] = "skip"
+
+    def pass_test_match(self, line):
+        if re.search(r'\[\s*OK \]', line) != None:
+            # If gtest says the test passed, check if it was skipped before marking it passed
+            if self.test_results.get(self.current_test, {}).get(self.current_profile, "") != "skip":
+                    self.test_results[self.current_test][self.current_profile] = "pass"
+            self.current_test = ""
+
+    def fail_test_match(self, line):
+        if re.search(r'\[\s*FAILED\s*\]', line) != None and self.current_test != "":
+            self.test_results[self.current_test][self.current_profile] = "fail"
+            self.current_test = ""
+
+    def unexpected_error_match(self, line):
+        if re.search(r'^Unexpected: ', line) != None:
+            self.unexpected_errors[self.current_test][self.current_profile] = "true"
+
+    def test_died(self):
+        print("A test likely crashed. Testing is being aborted.")
+        print("Final test output: ")
+        print(self.current_test_output)
+        sys.exit(1)
+
+def main():
+    parser = argparse.ArgumentParser(description='Parse the output from validation layer tests.')
+    parser.add_argument('--fail_on_skip', action='store_true', help="Makes the script exit with a "
+                        "non-zero exit code if a test didn't run on any device profile.")
+    parser.add_argument('--fail_on_unexpected', action='store_true', help="Makes the script exit "
+                        "with a non-zero exit code if a test causes unexpected errors.")
+    args = parser.parse_args()
+
+    stats = OutputStats()
+    for line in sys.stdin:
+        stats.match(line)
+    failed = stats.print_summary(args.fail_on_skip, args.fail_on_unexpected)
+    if failed == True:
+        print("\nFAILED CI")
+        sys.exit(1)
+
+if __name__ == '__main__':
+    main()