graphics: add IComposer service daemon

Since HALs might run binder services, we need to start thread pool for
both binder and hwbinder.

Bug: 32021609
Test: builds and boots
Change-Id: I9779e86b1e611a180b1984af36c417dafc3329bc
diff --git a/graphics/composer/2.1/default/service.cpp b/graphics/composer/2.1/default/service.cpp
new file mode 100644
index 0000000..0384a53
--- /dev/null
+++ b/graphics/composer/2.1/default/service.cpp
@@ -0,0 +1,56 @@
+/*
+ * Copyright 2016 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.
+ */
+
+#define LOG_TAG "HWComposerService"
+
+#include <binder/ProcessState.h>
+#include <hwbinder/IPCThreadState.h>
+#include <hwbinder/ProcessState.h>
+#include <utils/StrongPointer.h>
+#include "Hwc.h"
+
+using android::sp;
+using android::hardware::IPCThreadState;
+using android::hardware::ProcessState;
+using android::hardware::graphics::composer::V2_1::IComposer;
+using android::hardware::graphics::composer::V2_1::implementation::HIDL_FETCH_IComposer;
+
+int main()
+{
+    const char instance[] = "hwcomposer";
+
+    ALOGI("Service is starting.");
+
+    sp<IComposer> service = HIDL_FETCH_IComposer(instance);
+    if (service == nullptr) {
+        ALOGI("getService returned NULL");
+        return -1;
+    }
+
+    LOG_FATAL_IF(service->isRemote(), "Service is REMOTE!");
+
+    service->registerAsService(instance);
+
+    // the conventional HAL might start binder services
+    android::ProcessState::self()->setThreadPoolMaxThreadCount(4);
+    android::ProcessState::self()->startThreadPool();
+
+    ProcessState::self()->setThreadPoolMaxThreadCount(0);
+    ProcessState::self()->startThreadPool();
+    IPCThreadState::self()->joinThreadPool();
+
+    return 0;
+}