Add clang-format config file.

.clang-format

@@ -0,0 +1,35 @@
# Defines the Chromium style for automatic reformatting.
# http://clang.llvm.org/docs/ClangFormatStyleOptions.html
BasedOnStyle: Chromium
# This defaults to 'Auto'. Explicitly set it for a while, so that
# 'vector<vector<int> >' in existing files gets formatted to
# 'vector<vector<int>>'. ('Auto' means that clang-format will only use
# 'int>>' if the file already contains at least one such instance.)
Standard: Cpp11
# Make sure code like:
# IPC_BEGIN_MESSAGE_MAP()
#   IPC_MESSAGE_HANDLER(WidgetHostViewHost_Update, OnUpdate)
# IPC_END_MESSAGE_MAP()
# gets correctly indented.
MacroBlockBegin: "^\
BEGIN_MSG_MAP|\
BEGIN_MSG_MAP_EX|\
BEGIN_SAFE_MSG_MAP_EX|\
CR_BEGIN_MSG_MAP_EX|\
IPC_BEGIN_MESSAGE_MAP|\
IPC_BEGIN_MESSAGE_MAP_WITH_PARAM|\
IPC_PROTOBUF_MESSAGE_TRAITS_BEGIN|\
IPC_STRUCT_BEGIN|\
IPC_STRUCT_BEGIN_WITH_PARENT|\
IPC_STRUCT_TRAITS_BEGIN|\
POLPARAMS_BEGIN|\
PPAPI_BEGIN_MESSAGE_MAP$"
MacroBlockEnd: "^\
CR_END_MSG_MAP|\
END_MSG_MAP|\
IPC_END_MESSAGE_MAP|\
IPC_PROTOBUF_MESSAGE_TRAITS_END|\
IPC_STRUCT_END|\
IPC_STRUCT_TRAITS_END|\
POLPARAMS_END|\
PPAPI_END_MESSAGE_MAP$"