Implement robustness strings in requestMediaKeySystemAccess().

content/renderer/media/render_media_client_unittest.cc

Index: content/renderer/media/render_media_client_unittest.cc
diff --git a/content/renderer/media/render_media_client_unittest.cc b/content/renderer/media/render_media_client_unittest.cc
index 2366156bd39643c9fcaa96dbd8d233bb822d0faf..7ac253ef8d06d77b9e5f70eb5601c8ea69ae8e3f 100644
--- a/content/renderer/media/render_media_client_unittest.cc
+++ b/content/renderer/media/render_media_client_unittest.cc
@@ -27,6 +27,8 @@ class TestContentRendererClient : public ContentRendererClient {
     // TODO(sandersd): Was this supposed to be added to the list?
     media::KeySystemInfo key_system_info;
     key_system_info.key_system = "test.keysystem";
+    key_system_info.max_audio_robustness = media::EmeRobustness::EMPTY;
+    key_system_info.max_video_robustness = media::EmeRobustness::EMPTY;
     key_system_info.persistent_license_support =
         media::EME_SESSION_TYPE_NOT_SUPPORTED;
     key_system_info.persistent_release_message_support =
@@ -40,6 +42,8 @@ class TestContentRendererClient : public ContentRendererClient {
     if (is_extra_key_system_enabled_) {
       media::KeySystemInfo wv_key_system_info;
       wv_key_system_info.key_system = kWidevineKeySystem;
+      wv_key_system_info.max_audio_robustness = media::EmeRobustness::EMPTY;
+      wv_key_system_info.max_video_robustness = media::EmeRobustness::EMPTY;
       wv_key_system_info.persistent_license_support =
           media::EME_SESSION_TYPE_NOT_SUPPORTED;
       wv_key_system_info.persistent_release_message_support =