Added .proto parsing and convertion to .fbs.

Bug: 15777858
Change-Id: Iabef9b8c8044e593bb89510feebdee00d2f1840b
Tested: on Linux and Windows.
diff --git a/CMakeLists.txt b/CMakeLists.txt
index c526d51..a6f21cb 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -16,6 +16,7 @@
   src/idl_gen_general.cpp
   src/idl_gen_go.cpp
   src/idl_gen_text.cpp
+  src/idl_gen_fbs.cpp
   src/flatc.cpp
 )
 
@@ -25,6 +26,7 @@
   include/flatbuffers/util.h
   src/idl_parser.cpp
   src/idl_gen_text.cpp
+  src/idl_gen_fbs.cpp
   tests/test.cpp
   # file generate by running compiler on tests/monster_test.fbs
   ${CMAKE_CURRENT_BINARY_DIR}/tests/monster_test_generated.h