First part of an RPC mechanism for container <-> host communication

Mostly based on the protobuf based implementation from Mir.

Android.mk

@@ -0,0 +1,50 @@
+LOCAL_PATH:= $(call my-dir)
+
+include $(CLEAR_VARS)
+LOCAL_MODULE_TAGS := optional
+LOCAL_MODULE := libprocess-cpp-minimal
+LOCAL_SRC_FILES := \
+    external/process-cpp-minimal/src/core/posix/process.cpp \
+    external/process-cpp-minimal/src/core/posix/process_group.cpp \
+    external/process-cpp-minimal/src/core/posix/signal.cpp \
+    external/process-cpp-minimal/src/core/posix/signalable.cpp \
+    external/process-cpp-minimal/src/core/posix/standard_stream.cpp \
+    external/process-cpp-minimal/src/core/posix/wait.cpp
+LOCAL_CFLAGS := \
+    -fexceptions
+LOCAL_C_INCLUDES += \
+    $(LOCAL_PATH)/external/process-cpp-minimal/include
+include $(BUILD_STATIC_LIBRARY)
+
+include $(CLEAR_VARS)
+LOCAL_MODULE_TAGS := optional
+LOCAL_MODULE_CLASS := EXECUTABLES
+LOCAL_MODULE := anboxd
+LOCAL_SRC_FILES := \
+    android/service/main.cpp \
+    android/service/daemon.cpp \
+    android/service/host_connector.cpp \
+    android/service/local_socket_connection.cpp \
+    android/service/message_processor.cpp \
+    src/anbox/common/fd.cpp \
+    src/anbox/bridge/message_processor.cpp \
+    src/anbox/bridge/pending_call_cache.cpp \
+    src/anbox/bridge/rpc_channel.cpp \
+    src/anbox/protobuf/bridge.proto
+proto_header_dir := $(call local-generated-sources-dir)/proto/$(LOCAL_PATH)/src/anbox/protobuf
+LOCAL_C_INCLUDES += \
+    $(proto_header_dir) \
+    $(LOCAL_PATH)/external/process-cpp-minimal/include \
+    $(LOCAL_PATH)/src \
+    $(LOCAL_PATH)/android/service
+LOCAL_EXPORT_C_INCLUDE_DIRS += $(proto_header_dir)
+LOCAL_STATIC_LIBRARIES := \
+    libprocess-cpp-minimal
+LOCAL_SHARED_LIBRARIES := \
+    liblog \
+    libprotobuf-cpp-lite \
+    libsysutils
+LOCAL_CFLAGS := \
+    -fexceptions \
+    -std=c++1y
+include $(BUILD_EXECUTABLE)