Create contrib folder for new boosted_trees library.

Change: 149105174

tensorflow/contrib/boosted_trees/BUILD

@@ -0,0 +1,19 @@
+# TensorFlow code for training gradient boosted trees.
+licenses(["notice"])  # Apache 2.0
+
+exports_files(["LICENSE"])
+
+package(default_visibility = [
+    "//visibility:public",
+])
+
+filegroup(
+    name = "all_files",
+    srcs = glob(
+        ["**/*"],
+        exclude = [
+            "**/OWNERS",
+        ],
+    ),
+    visibility = ["//tensorflow:__subpackages__"],
+)