Change buckifier to support parameterized dependencies (#5648)

Summary:
Users may desire to specify extra dependencies via buck. This PR allows users to pass additional dependencies as a JSON object so that the buckifier script can generate TARGETS file with desired extra dependencies.

Test plan (on dev server)
```
$python buckifier/buckify_rocksdb.py '{"fake": {"extra_deps": [":test_dep", "//fakes/module:mock1"], "extra_compiler_flags": ["-DROCKSDB_LITE", "-Os"]}}'
Generating TARGETS
Extra dependencies:
{'': {'extra_compiler_flags': [], 'extra_deps': []}, 'test_dep1': {'extra_compiler_flags': ['-O2', '-DROCKSDB_LITE'], 'extra_deps': [':fake', '//dep1/mock']}}
Generated TARGETS Summary:
- 5 libs
- 0 binarys
- 296 tests
```
Verify the TARGETS file.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/5648

Differential Revision: D16565043

Pulled By: riversand963

fbshipit-source-id: a6ef02274174fcf159692d7b846e828454d01e89

1 files changed, 5 insertions, 3 deletions

diff --git a/defs.bzl b/defs.bzl
index a9f25ebcc..d5b7b6af7 100644
--- a/defs.bzl
+++ b/defs.bzl
@@ -12,7 +12,9 @@ def test_binary(
         rocksdb_compiler_flags,
         rocksdb_preprocessor_flags,
         rocksdb_external_deps,
-        rocksdb_os_deps):
+        rocksdb_os_deps,
+        extra_deps,
+        extra_compiler_flags):
     TEST_RUNNER = native.package_name() + "/buckifier/rocks_test_runner.sh"
 
     ttype = "gtest" if parallelism == "parallel" else "simple"
@@ -23,9 +25,9 @@ def test_binary(
         srcs = [test_cc],
         arch_preprocessor_flags = rocksdb_arch_preprocessor_flags,
         os_preprocessor_flags = rocksdb_os_preprocessor_flags,
-        compiler_flags = rocksdb_compiler_flags,
+        compiler_flags = rocksdb_compiler_flags + extra_compiler_flags,
         preprocessor_flags = rocksdb_preprocessor_flags,
-        deps = [":rocksdb_test_lib"],
+        deps = [":rocksdb_test_lib"] + extra_deps,
         os_deps = rocksdb_os_deps,
         external_deps = rocksdb_external_deps,
     )