Create a single test binary.

To run individual test suite, follow the example shown below:
adb shell LD_LIBRARY_PATH=/system/vendor/lib/mediadrm /system/bin/ClearKeyDrmUnitTest
--gtest_filter=JsonWebKeyTest.*

Change-Id: I8ecc944a734cde351505a7cd8c3997976d74553b
diff --git a/drm/mediadrm/plugins/clearkey/tests/Android.mk b/drm/mediadrm/plugins/clearkey/tests/Android.mk
index 0c895ea..ac5bb21 100644
--- a/drm/mediadrm/plugins/clearkey/tests/Android.mk
+++ b/drm/mediadrm/plugins/clearkey/tests/Android.mk
@@ -18,17 +18,35 @@
 #
 LOCAL_PATH := $(call my-dir)
 
-test_name := JsonWebKeyUnittest
-test_src_dir := .
-include $(LOCAL_PATH)/unit-test.mk
+include $(CLEAR_VARS)
+LOCAL_MODULE := ClearKeyDrmUnitTest
+LOCAL_MODULE_TAGS := tests
 
-test_name := AesCtrDecryptorUnittest
-test_src_dir := .
-include $(LOCAL_PATH)/unit-test.mk
+LOCAL_SRC_FILES := \
+    AesCtrDecryptorUnittest.cpp \
+    InitDataParserUnittest.cpp \
+    JsonWebKeyUnittest.cpp \
 
-test_name := InitDataParserUnittest
-test_src_dir := .
-include $(LOCAL_PATH)/unit-test.mk
+LOCAL_C_INCLUDES := \
+    bionic \
+    external/gtest/include \
+    external/jsmn \
+    external/openssl/include \
+    external/stlport/stlport \
+    frameworks/av/drm/mediadrm/plugins/clearkey \
+    frameworks/av/include \
+    frameworks/native/include \
 
-test_name :=
-test_src_dir :=
+LOCAL_STATIC_LIBRARIES := \
+    libgtest \
+    libgtest_main \
+
+LOCAL_SHARED_LIBRARIES := \
+    libcrypto \
+    libdrmclearkeyplugin \
+    liblog \
+    libstagefright_foundation \
+    libstlport \
+    libutils \
+
+include $(BUILD_NATIVE_TEST)
diff --git a/drm/mediadrm/plugins/clearkey/tests/unit-test.mk b/drm/mediadrm/plugins/clearkey/tests/unit-test.mk
deleted file mode 100644
index e33ea52..0000000
--- a/drm/mediadrm/plugins/clearkey/tests/unit-test.mk
+++ /dev/null
@@ -1,52 +0,0 @@
-#
-# Copyright (C) 2014 The Android Open Source Project
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#      http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-#
-# -------------------------------------------------------------------
-# Makes a unit or end to end test.
-# test_name must be passed in as the base filename(without the .cpp).
-#
-$(call assert-not-null,test_name)
-
-include $(CLEAR_VARS)
-
-LOCAL_MODULE := $(test_name)
-LOCAL_MODULE_TAGS := tests
-
-LOCAL_SRC_FILES := \
-    $(test_src_dir)/$(test_name).cpp
-
-LOCAL_C_INCLUDES := \
-    bionic \
-    external/gtest/include \
-    external/jsmn \
-    external/openssl/include \
-    external/stlport/stlport \
-    frameworks/av/drm/mediadrm/plugins/clearkey \
-    frameworks/av/include \
-    frameworks/native/include \
-
-LOCAL_STATIC_LIBRARIES := \
-    libgtest \
-    libgtest_main \
-
-LOCAL_SHARED_LIBRARIES := \
-    libcrypto \
-    libdrmclearkeyplugin \
-    liblog \
-    libstagefright_foundation \
-    libstlport \
-    libutils \
-
-include $(BUILD_NATIVE_TEST)