Added PROTOBUF_PYTHON_ALLOW_OVERSIZE_PROTOS macro and setting it when
--allow_oversize_protos=true is passed to bazel build.
When this macro is set, SetTotalBytesLimit is called to remove
the 64MB limit on binary protos when during ParseFromString.
diff --git a/BUILD b/BUILD
index 3cac4a8..c4de1c4 100644
--- a/BUILD
+++ b/BUILD
@@ -462,11 +462,11 @@
     name = "gen_well_known_protos_java",
     srcs = WELL_KNOWN_PROTOS,
     outs = [
-        "wellknown.srcjar"
+        "wellknown.srcjar",
     ],
     cmd = "$(location :protoc) --java_out=$(@D)/wellknown.jar" +
-        " -Isrc $(SRCS) " +
-        " && mv $(@D)/wellknown.jar $(@D)/wellknown.srcjar",
+          " -Isrc $(SRCS) " +
+          " && mv $(@D)/wellknown.jar $(@D)/wellknown.srcjar",
     tools = [":protoc"],
 )
 
@@ -539,7 +539,10 @@
     ]),
     copts = COPTS + [
         "-DGOOGLE_PROTOBUF_HAS_ONEOF=1",
-    ],
+    ] + select({
+        "//conditions:default": [],
+        ":allow_oversize_protos": ["-DPROTOBUF_PYTHON_ALLOW_OVERSIZE_PROTOS=1"],
+    }),
     includes = [
         "python/",
         "src/",
@@ -561,6 +564,13 @@
     },
 )
 
+config_setting(
+    name = "allow_oversize_protos",
+    values = {
+        "define": "allow_oversize_protos=true",
+    },
+)
+
 py_proto_library(
     name = "protobuf_python",
     srcs = WELL_KNOWN_PROTOS,