Added PriorityDump helper util

Utility function to help services dump data in buckets (CRITICAL, HIGH,
NORMAL). Function parses --dump_priority argument to select which
sections to dump.

BUG: 27429130

Test: mmm -j32 frameworks/native/services/utils && \
      adb sync data && adb shell /data/nativetest/prioritydumper_test/prioritydumper_test && \
      adb shell  /data/nativetest64/prioritydumper_test/prioritydumper_test && \
      printf "\n\n#### ALL TESTS PASSED ####\n"

Change-Id: Ic529e136acfa4df82653b6b648cd540dada3ee96
diff --git a/services/utils/tests/Android.bp b/services/utils/tests/Android.bp
new file mode 100644
index 0000000..5a9dc0a
--- /dev/null
+++ b/services/utils/tests/Android.bp
@@ -0,0 +1,32 @@
+// Copyright (C) 2017 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.
+
+// Build unit tests.
+
+cc_test {
+    name: "prioritydumper_test",
+    test_suites: ["device-tests"],
+    srcs: [ "PriorityDumper_test.cpp"],
+    shared_libs: [
+        "libutils",
+    ],
+    cflags: [
+        "-Wno-unused-parameter",
+    ],
+    static_libs = [
+        "libgmock",
+        "libserviceutils"
+    ],
+    clang: true,
+}
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diff --git a/services/utils/tests/AndroidTest.xml b/services/utils/tests/AndroidTest.xml
new file mode 100644
index 0000000..83c890d
--- /dev/null
+++ b/services/utils/tests/AndroidTest.xml
@@ -0,0 +1,26 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2017 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.
+-->
+<configuration description="Config for prioritydumper_test">
+  <target_preparer class="com.android.tradefed.targetprep.PushFilePreparer">
+    <option name="cleanup" value="true" />
+    <option name="push" value="prioritydumper_test->/data/local/tmp/prioritydumper_test" />
+  </target_preparer>
+  <option name="test-suite-tag" value="apct" />
+  <test class="com.android.tradefed.testtype.GTest" >
+    <option name="native-test-device-path" value="/data/local/tmp" />
+    <option name="module-name" value="prioritydumper_test" />
+  </test>
+</configuration>
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diff --git a/services/utils/tests/PriorityDumper_test.cpp b/services/utils/tests/PriorityDumper_test.cpp
new file mode 100644
index 0000000..c5a121e
--- /dev/null
+++ b/services/utils/tests/PriorityDumper_test.cpp
@@ -0,0 +1,139 @@
+/*
+ * Copyright (C) 2017 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 "PriorityDumper.h"
+
+#include <vector>
+
+#include <gmock/gmock.h>
+#include <gtest/gtest.h>
+
+#include <utils/String16.h>
+#include <utils/Vector.h>
+
+using namespace android;
+
+using ::testing::ElementsAreArray;
+using ::testing::Mock;
+using ::testing::Test;
+
+class PriorityDumperMock : public PriorityDumper {
+public:
+    MOCK_METHOD2(dumpCritical, void(int, const Vector<String16>&));
+    MOCK_METHOD2(dumpHigh, void(int, const Vector<String16>&));
+    MOCK_METHOD2(dumpNormal, void(int, const Vector<String16>&));
+    MOCK_METHOD2(dump, void(int, const Vector<String16>&));
+};
+
+class DumpAllMock : public PriorityDumper {
+public:
+    MOCK_METHOD2(dumpCritical, void(int, const Vector<String16>&));
+    MOCK_METHOD2(dumpHigh, void(int, const Vector<String16>&));
+    MOCK_METHOD2(dumpNormal, void(int, const Vector<String16>&));
+};
+
+class PriorityDumperTest : public Test {
+public:
+    PriorityDumperTest() : dumper_(), dumpAlldumper_(), fd(1) {}
+    PriorityDumperMock dumper_;
+    DumpAllMock dumpAlldumper_;
+    int fd;
+};
+
+static void addAll(Vector<String16>& av, const std::vector<std::string>& v) {
+    for (auto element : v) {
+        av.add(String16(element.c_str()));
+    }
+}
+
+TEST_F(PriorityDumperTest, noArgsPassed) {
+    Vector<String16> args;
+    EXPECT_CALL(dumper_, dump(fd, ElementsAreArray(args)));
+    priorityDump(dumper_, fd, args);
+}
+
+TEST_F(PriorityDumperTest, noPriorityArgsPassed) {
+    Vector<String16> args;
+    addAll(args, {"bunch", "of", "args"});
+    EXPECT_CALL(dumper_, dump(fd, ElementsAreArray(args)));
+    priorityDump(dumper_, fd, args);
+}
+
+TEST_F(PriorityDumperTest, priorityArgsOnly) {
+    Vector<String16> args;
+    addAll(args, {"--dump-priority", "CRITICAL"});
+    Vector<String16> strippedArgs;
+    EXPECT_CALL(dumper_, dumpCritical(fd, ElementsAreArray(strippedArgs)));
+
+    priorityDump(dumper_, fd, args);
+}
+
+TEST_F(PriorityDumperTest, dumpCritical) {
+    Vector<String16> args;
+    addAll(args, {"--dump-priority", "CRITICAL", "args", "left", "behind"});
+    Vector<String16> strippedArgs;
+    addAll(strippedArgs, {"args", "left", "behind"});
+
+    EXPECT_CALL(dumper_, dumpCritical(fd, ElementsAreArray(strippedArgs)));
+    priorityDump(dumper_, fd, args);
+}
+
+TEST_F(PriorityDumperTest, dumpHigh) {
+    Vector<String16> args;
+    addAll(args, {"--dump-priority", "HIGH", "args", "left", "behind"});
+    Vector<String16> strippedArgs;
+    addAll(strippedArgs, {"args", "left", "behind"});
+
+    EXPECT_CALL(dumper_, dumpHigh(fd, ElementsAreArray(strippedArgs)));
+    priorityDump(dumper_, fd, args);
+}
+
+TEST_F(PriorityDumperTest, dumpNormal) {
+    Vector<String16> args;
+    addAll(args, {"--dump-priority", "NORMAL", "args", "left", "behind"});
+    Vector<String16> strippedArgs;
+    addAll(strippedArgs, {"args", "left", "behind"});
+
+    EXPECT_CALL(dumper_, dumpNormal(fd, ElementsAreArray(strippedArgs)));
+    priorityDump(dumper_, fd, args);
+}
+
+TEST_F(PriorityDumperTest, dumpAll) {
+    Vector<String16> args;
+    addAll(args, {"args", "left", "behind"});
+
+    EXPECT_CALL(dumpAlldumper_, dumpCritical(fd, ElementsAreArray(args)));
+    EXPECT_CALL(dumpAlldumper_, dumpHigh(fd, ElementsAreArray(args)));
+    EXPECT_CALL(dumpAlldumper_, dumpNormal(fd, ElementsAreArray(args)));
+
+    priorityDump(dumpAlldumper_, fd, args);
+}
+
+TEST_F(PriorityDumperTest, priorityArgWithPriorityMissing) {
+    Vector<String16> args;
+    addAll(args, {"--dump-priority"});
+    EXPECT_CALL(dumper_, dump(fd, ElementsAreArray(args)));
+
+    priorityDump(dumper_, fd, args);
+}
+
+TEST_F(PriorityDumperTest, priorityArgWithInvalidPriority) {
+    Vector<String16> args;
+    addAll(args, {"--dump-priority", "REALLY_HIGH"});
+    EXPECT_CALL(dumper_, dump(fd, ElementsAreArray(args)));
+
+    priorityDump(dumper_, fd, args);
+}
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