Created a dumpstate service.

For now this is still a limited service:

- It's only created when running an interactive bugreport.
- It only provides a listener to get updates.
- It will be just used by Shell to get updates.

Test: dumpstate_test passes
BUG: 31636879

Change-Id: Iae820261d220523c979bf905030456fcf0b2b618
diff --git a/cmds/dumpstate/DumpstateService.h b/cmds/dumpstate/DumpstateService.h
new file mode 100644
index 0000000..544a7b6
--- /dev/null
+++ b/cmds/dumpstate/DumpstateService.h
@@ -0,0 +1,50 @@
+/**
+ * Copyright (c) 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.
+ */
+
+#ifndef ANDROID_OS_DUMPSTATE_H_
+#define ANDROID_OS_DUMPSTATE_H_
+
+#include <mutex>
+#include <vector>
+
+#include <binder/BinderService.h>
+
+#include "android/os/BnDumpstate.h"
+#include "dumpstate.h"
+
+namespace android {
+namespace os {
+
+class DumpstateService : public BinderService<DumpstateService>, public BnDumpstate {
+  public:
+    DumpstateService();
+
+    static status_t Start();
+    static char const* getServiceName();
+
+    status_t dump(int fd, const Vector<String16>& args) override;
+    binder::Status setListener(const std::string& name, const sp<IDumpstateListener>& listener,
+                               bool* set) override;
+
+  private:
+    Dumpstate& ds_;
+    std::mutex lock_;
+};
+
+}  // namespace os
+}  // namespace android
+
+#endif  // ANDROID_OS_DUMPSTATE_H_