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diff --git a/third_party/googleapis/google/maps/postprocessing.bzl b/third_party/googleapis/google/maps/postprocessing.bzl
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+++ b/third_party/googleapis/google/maps/postprocessing.bzl
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+"""
+Defines the postprocessing build rule for the Google Maps APIs.
+"""
+
+def maps_assembly_pkg(name, srcs, language, visibility = None):
+    """Target to build a post-processed ads-specific GAPIC assembly package.
+
+    Explodes a GAPIC assembly package, runs language-specific post-processing, and repackages.
+
+    This macro assumes srcs contains in a single input, namely a {{language}}_assembly_pkg target
+    produced by a gapic-generator build target.
+
+    There must be a corresponding postprocessing_{language}.sh script to invoke.
+
+    Args:
+      name: defines the name of the main target
+      srcs: collection containing exactly 1 build target, namely a
+        {{language}}_assembly_pkg target produced by gapic-generator
+      language: the programming language to post-process
+        (e.g., "java", "csharp", "php", etc.); there must be a matching
+        post-processin script of the form `postprocessing_{language}.sh
+        in this package
+      visibility (optional): marco visibility setting;
+        (see https://docs.bazel.build/versions/master/skylark/macros.html)
+    """
+    cmd = """
+    set -eu
+
+    tar xzf $(SRCS);
+    $(location //google/maps:postprocessing_%s) %s;
+    tar czf $@ %s
+    """
+    dir_name = _extract_path(srcs)
+
+    native.genrule(
+        name = name,
+        srcs = srcs,
+        outs = ["%s.tar.gz" % name],
+        cmd = cmd % (language, dir_name, dir_name),
+        tools = ["//google/maps:postprocessing_%s" % language],
+        visibility = visibility,
+    )
+
+def _extract_path(srcs):
+    """Takes the first label in srcs and returns its target name.
+
+    Args:
+      srcs: a collection of build labels of the form "//package/name:target"
+
+    Returns:
+      The first element's target (i.e.- the part after the ":"), else None if empty.
+    """
+
+    for s in srcs:
+        toks = s.split(":")
+        if len(toks) == 2:
+            return toks[1]
+    return None