Possible build failure due to missing dependency on 'commands_proto' from 'key_info_util'

[yukawa]

When commands.proto was moved from src/session/commands.proto to protocol/commands.proto by dbe8005, 'src/session/session_base.gyp' was not correctly updated to teach GYP that key_info_util GYP target depends on commands_proto GYP target. Although the lack of build dependency may or may not cause build failure depending on the build target and build order, the following command can always reproduce the build failure.

python build_mozc.py gyp
python build_mozc.py build -j1 -c Release session/session_base.gyp:key_info_util

Here is the error message you would see.

ninja: Entering directory `out_linux/Release'
[78/80] CXX obj/session/key_info_util.key_info_util.o
FAILED: /usr/bin/clang++ -MMD -MF obj/session/key_info_util.key_info_util.o.d -DOS_LINUX -DMOZC_BUILD -DCHANNEL_DEV -DENABLE_GTK_RENDERER -DMOZC_ENABLE_UNITTEST -DNDEBUG -DQT_NO_DEBUG -DNO_LOGGING -DIGNORE_HELP_FLAG -DIGNORE_INVALID_FLAG -I/home/mozc_builder/work/mozc/src -Igen -Igen/proto_out -I../../third_party/protobuf/src -Wall -Wno-char-subscripts -Wno-sign-compare -Wno-deprecated-declarations -Wwrite-strings -fPIC -fno-exceptions -fmessage-length=0 -fno-strict-aliasing -funsigned-char -include base/namespace.h -pipe -pthread -fno-omit-frame-pointer -fstack-protector --param=ssp-buffer-size=4 -Wtype-limits -O2 -Wno-deprecated -Wno-covered-switch-default -Wno-unnamed-type-template-args -Wno-c++11-narrowing -std=gnu++0x -std=gnu++0x  -c ../../session/key_info_util.cc -o obj/session/key_info_util.key_info_util.o
../../session/key_info_util.cc:43:10: fatal error: 'protocol/commands.pb.h' file not found
#include "protocol/commands.pb.h"
         ^
1 error generated.
ninja: build stopped: subcommand failed.
Traceback (most recent call last):
  File "build_mozc.py", line 1454, in <module>
    main()
  File "build_mozc.py", line 1450, in main
    procedure[1](cmd_opts, cmd_args, original_directory_name)
  File "build_mozc.py", line 1070, in BuildMain
    BuildOnLinux(options, targets, original_directory_name)
  File "build_mozc.py", line 1026, in BuildOnLinux
    RunOrDie([make_command] + build_args + target_names)
  File "/home/mozc_builder/work/mozc/src/build_tools/util.py", line 99, in RunOrDie
    '==========']))
build_tools.util.RunOrDieError: 
==========
 ERROR: ninja -j 1 -C out_linux/Release key_info_util
==========