[bazel] Allow maven deps to be excluded from pom files

This follows the same naming convention used by Google's rules
for generating pom files (as we do with the maven_coordinates
tag). This is to allow us to be as compatible as possible.

java/maven.bzl

@@ -24,6 +24,14 @@ def _has_maven_deps_impl(target, ctx):
 
     coordinates = []
     for tag in tags:
+        if tag == "maven:compile_only":
+            return MavenInfo(
+                coordinates = None,
+                maven_deps = depset(),
+                artifact_jars = depset(),
+                source_jars = depset(),
+                transitive_maven_deps = depset(),
+            )
         if tag.startswith(_PREFIX):
             coordinates.append(tag[len(_PREFIX):])
     if len(coordinates) > 1:

third_party/java/auto/BUILD.bazel

@@ -9,6 +9,9 @@ maven_java_import(
     coords = "com.google.auto:auto-common:jar:0.8",
     jar = "auto-common-0.8.jar",
     srcjar = "auto-common-0.8-sources.jar",
+    tags = [
+        "maven:compile_only",
+    ],
     deps = [
         "//third_party/java/guava",
     ],

third_party/java/rules.bzl

@@ -2,15 +2,17 @@ def _add_maven_coords(tags, coords):
     tags.append("maven_coordinates=" + coords)
     return tags
 
-def maven_java_import(name, coords, jar, srcjar = None, visibility = None, deps = None):
+def maven_java_import(name, coords, jar, srcjar = None, visibility = None, deps = None, **kwargs):
+    tags = _add_maven_coords(kwargs.pop("tags", default = []), coords)
     native.java_import(
         name = name,
-        tags = _add_maven_coords([], coords),
+        tags = tags,
         jars = [jar],
         srcjar = srcjar,
         visibility = visibility,
         deps = deps,
         exports = deps,
+        **kwargs
     )
 
 def maven_java_library(name, coords, **kwargs):

third_party/java/service/BUILD.bazel

@@ -9,6 +9,9 @@ maven_java_import(
     coords = "com.google.auto.service:auto-service:jar:1.0-rc4",
     jar = "auto-service-1.0-rc4.jar",
     srcjar = "auto-service-1.0-rc4-sources.jar",
+    tags = [
+        "maven:compile_only",
+    ],
     visibility = ["//visibility:private"],
     deps = [
         "//third_party/java/auto:auto-common",