Add support for robolectric play-services-shadows.

third_party/robolectric/BUILD.gn

Index: third_party/robolectric/BUILD.gn
diff --git a/third_party/robolectric/BUILD.gn b/third_party/robolectric/BUILD.gn
index ccbfc350b6c66827bb7327d9630ea758665e1439..47b434d3354f7b9eeb8dfb55e19b70c8a4e4a4e4 100644
--- a/third_party/robolectric/BUILD.gn
+++ b/third_party/robolectric/BUILD.gn
@@ -14,6 +14,7 @@ java_group("robolectric_all_java") {
     ":robolectric_utils_java",
     ":shadows_core_java",
     ":shadows_multidex_java",
+    ":shadows_play_services_java",
   ]
 }
 
@@ -41,6 +42,7 @@ java_library("robolectric_java") {
     ":robolectric_utils_java",
     ":shadows_core_java",
     ":shadows_multidex_java",
+    ":shadows_play_services_java",
     "//third_party/bouncycastle:bouncycastle_java",
     "//third_party/guava:guava_java",
     "//third_party/icu4j:icu4j_java",
@@ -664,3 +666,31 @@ java_library("shadows_multidex_java") {
   # Work-around for gradle generator not yet supporting annotation processors.
   gradle_treat_as_prebuilt = true
 }
+
+java_library("shadows_play_services_java") {
+  testonly = true
+  processors_javac =
+      [ "org.robolectric.annotation.processing.RobolectricProcessor" ]
+  processor_args_javac = [ "org.robolectric.annotation.processing.shadowPackage=org.robolectric.shadows.gms" ]
+  provider_configurations = [ "robolectric/robolectric-shadows/shadows-play-services/src/main/resources/META-INF/services/org.robolectric.internal.ShadowProvider" ]
+  java_files = [
+    "robolectric/robolectric-shadows/shadows-play-services/src/main/java/org/robolectric/shadows/gms/ShadowGoogleAuthUtil.java",
+    "robolectric/robolectric-shadows/shadows-play-services/src/main/java/org/robolectric/shadows/gms/ShadowGooglePlayServicesUtil.java",
+    "robolectric/robolectric-shadows/shadows-play-services/src/main/java/org/robolectric/shadows/gms/common/ShadowGoogleApiAvailability.java",
+    "robolectric/robolectric-shadows/shadows-play-services/src/main/java/org/robolectric/shadows/gms/package-info.java",
+  ]
+
+  deps = [
+    ":android-all-7.1.0_r7-robolectric-0_java",
+    ":robolectric_annotations_java",
+    ":robolectric_processor_java",
+    ":robolectric_resources_java",
+    ":robolectric_utils_java",
+    "//third_party/android_tools:android_support_v4_java",
+    "//third_party/guava:guava_java",
+    google_play_services_library,
+  ]
+
+  # Work-around for gradle generator not yet supporting annotation processors.
+  gradle_treat_as_prebuilt = true
+}