SF: Optionally skip slow unittests

TimeStatsTest::canDumpWithInvalidMaxLayers can take many seconds to run
(even a full minute, depending on the target).

Add a new flag "--no-slow" for libsurfaceflinger_unittests which will
cause it to skip slow tests like these, and add a check to that test
which checks for that flag to skip it.

To run use it with atest, you need to use:

    atest libsurfaceflinger_unittest -- --module-arg libsurfaceflinger_unittest:native-test-flag:--no-slow

Bug: None
Test: atest libsurfaceflinger_unittest

Change-Id: I433c1707eb52866fb9f5c61956db338cc5c58723
diff --git a/services/surfaceflinger/tests/unittests/Android.bp b/services/surfaceflinger/tests/unittests/Android.bp
index 42b7146..1a13f77 100644
--- a/services/surfaceflinger/tests/unittests/Android.bp
+++ b/services/surfaceflinger/tests/unittests/Android.bp
@@ -24,6 +24,7 @@
     },
     srcs: [
         ":libsurfaceflinger_sources",
+        "libsurfaceflinger_unittest_main.cpp",
         "CompositionTest.cpp",
         "DisplayIdentificationTest.cpp",
         "DisplayTransactionTest.cpp",
diff --git a/services/surfaceflinger/tests/unittests/TimeStatsTest.cpp b/services/surfaceflinger/tests/unittests/TimeStatsTest.cpp
index bfd34cd..86f1a39 100644
--- a/services/surfaceflinger/tests/unittests/TimeStatsTest.cpp
+++ b/services/surfaceflinger/tests/unittests/TimeStatsTest.cpp
@@ -27,6 +27,8 @@
 
 #include "TimeStats/TimeStats.h"
 
+#include "libsurfaceflinger_unittest_main.h"
+
 using namespace android::surfaceflinger;
 using namespace google::protobuf;
 
@@ -486,6 +488,10 @@
 }
 
 TEST_F(TimeStatsTest, canSurviveMonkey) {
+    if (g_noSlowTests) {
+        GTEST_SKIP();
+    }
+
     EXPECT_TRUE(inputCommand(InputCommand::ENABLE, FMT_STRING).empty());
 
     for (size_t i = 0; i < 10000000; ++i) {
diff --git a/services/surfaceflinger/tests/unittests/libsurfaceflinger_unittest_main.cpp b/services/surfaceflinger/tests/unittests/libsurfaceflinger_unittest_main.cpp
new file mode 100644
index 0000000..bc1f00d
--- /dev/null
+++ b/services/surfaceflinger/tests/unittests/libsurfaceflinger_unittest_main.cpp
@@ -0,0 +1,49 @@
+/*
+ * Copyright 2018 The Android Open Source Project
+ *
+ * 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.
+ */
+
+#include <gtest/gtest.h>
+
+#include "libsurfaceflinger_unittest_main.h"
+
+// ------------------------------------------------------------------------
+// To pass extra command line arguments to the Google Test executable from
+// atest, you have to use this somewhat verbose syntax:
+//
+// clang-format off
+//
+//     atest libsurfaceflinger_unittest -- --module-arg libsurfaceflinger_unittest:native-test-flag:<--flag>[:<value>]
+//
+// For example:
+//
+//     atest libsurfaceflinger_unittest -- --module-arg libsurfaceflinger_unittest:native-test-flag:--no-slow
+//
+// clang-format on
+//  ------------------------------------------------------------------------
+
+// Set to true if "--no-slow" is passed to the test.
+bool g_noSlowTests = false;
+
+int main(int argc, char **argv) {
+    ::testing::InitGoogleTest(&argc, argv);
+
+    for (int i = 1; i < argc; i++) {
+        if (strcmp(argv[i], "--no-slow") == 0) {
+            g_noSlowTests = true;
+        }
+    }
+
+    return RUN_ALL_TESTS();
+}
\ No newline at end of file
diff --git a/services/surfaceflinger/tests/unittests/libsurfaceflinger_unittest_main.h b/services/surfaceflinger/tests/unittests/libsurfaceflinger_unittest_main.h
new file mode 100644
index 0000000..e742c50
--- /dev/null
+++ b/services/surfaceflinger/tests/unittests/libsurfaceflinger_unittest_main.h
@@ -0,0 +1,20 @@
+/*
+ * Copyright 2018 The Android Open Source Project
+ *
+ * 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.
+ */
+
+#pragma once
+
+// Set to true if "--no-slow" is passed to the test.
+extern bool g_noSlowTests;