Update //third_party/protobuf to version 3.

third_party/protobuf/cmake/install.cmake

+include(GNUInstallDirs)
+
+foreach(_library
+  libprotobuf-lite
+  libprotobuf
+  libprotoc)
+  set_property(TARGET ${_library}
+    PROPERTY INTERFACE_INCLUDE_DIRECTORIES
+    $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>)
+  install(TARGETS ${_library} EXPORT protobuf-targets
+    RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR} COMPONENT ${_library}
+    LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR} COMPONENT ${_library}
+    ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR} COMPONENT ${_library})
+endforeach()
+
+install(TARGETS protoc EXPORT protobuf-targets
+  RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR} COMPONENT protoc)
+
+if(TRUE)
+  file(STRINGS extract_includes.bat.in _extract_strings
+    REGEX "^copy")
+  foreach(_extract_string ${_extract_strings})
+    string(REPLACE "copy \${PROTOBUF_SOURCE_WIN32_PATH}\\" ""
+      _extract_string ${_extract_string})
+    string(REPLACE "\\" "/" _extract_string ${_extract_string})
+    string(REGEX MATCH "^[^ ]+"
+      _extract_from ${_extract_string})
+    string(REGEX REPLACE "^${_extract_from} ([^$]+)" "\\1"
+      _extract_to ${_extract_string})
+    get_filename_component(_extract_from "${protobuf_SOURCE_DIR}/${_extract_from}" ABSOLUTE)
+    get_filename_component(_extract_name ${_extract_to} NAME)
+    get_filename_component(_extract_to ${_extract_to} PATH)
+    string(REPLACE "include/" "${CMAKE_INSTALL_INCLUDEDIR}/"
+      _extract_to "${_extract_to}")
+    if(EXISTS "${_extract_from}")
+      install(FILES "${_extract_from}"
+        DESTINATION "${_extract_to}"
+        COMPONENT protobuf-headers
+        RENAME "${_extract_name}")
+    else()
+      message(AUTHOR_WARNING "The file \"${_extract_from}\" is listed in "
+        "\"${protobuf_SOURCE_DIR}/cmake/extract_includes.bat.in\" "
+        "but there not exists. The file will not be installed.")
+    endif()
+  endforeach()
+endif()
+
+# Internal function for parsing auto tools scripts
+function(_protobuf_auto_list FILE_NAME VARIABLE)
+  file(STRINGS ${FILE_NAME} _strings)
+  set(_list)
+  foreach(_string ${_strings})
+    set(_found)
+    string(REGEX MATCH "^[ \t]*${VARIABLE}[ \t]*=[ \t]*" _found "${_string}")
+    if(_found)
+      string(LENGTH "${_found}" _length)
+      string(SUBSTRING "${_string}" ${_length} -1 _draft_list)
+      foreach(_item ${_draft_list})
+        string(STRIP "${_item}" _item)
+        list(APPEND _list "${_item}")
+      endforeach()
+    endif()
+  endforeach()
+  set(${VARIABLE} ${_list} PARENT_SCOPE)
+endfunction()
+
+# Install well-known type proto files
+_protobuf_auto_list("../src/Makefile.am" nobase_dist_proto_DATA)
+foreach(_file ${nobase_dist_proto_DATA})
+  get_filename_component(_file_from "../src/${_file}" ABSOLUTE)
+  get_filename_component(_file_name ${_file} NAME)
+  get_filename_component(_file_path ${_file} PATH)
+  if(EXISTS "${_file_from}")
+    install(FILES "${_file_from}"
+      DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}/${_file_path}"
+      COMPONENT protobuf-protos
+      RENAME "${_file_name}")
+  else()
+    message(AUTHOR_WARNING "The file \"${_file_from}\" is listed in "
+      "\"${protobuf_SOURCE_DIR}/../src/Makefile.am\" as nobase_dist_proto_DATA "
+      "but there not exists. The file will not be installed.")
+  endif()
+endforeach()
+
+# Export configuration
+
+install(EXPORT protobuf-targets
+  DESTINATION "lib/cmake/protobuf"
+  COMPONENT protobuf-export)
+
+configure_file(protobuf-config.cmake.in
+  protobuf-config.cmake @ONLY)
+configure_file(protobuf-config-version.cmake.in
+  protobuf-config-version.cmake @ONLY)
+configure_file(protobuf-module.cmake.in
+  protobuf-module.cmake @ONLY)
+
+install(FILES
+  "${protobuf_BINARY_DIR}/protobuf-config.cmake"
+  "${protobuf_BINARY_DIR}/protobuf-config-version.cmake"
+  "${protobuf_BINARY_DIR}/protobuf-module.cmake"
+  DESTINATION "lib/cmake/protobuf"
+  COMPONENT protobuf-export)