Tracks GVR version crossed with headset type using UMA.

chrome/android/BUILD.gn

Index: chrome/android/BUILD.gn
diff --git a/chrome/android/BUILD.gn b/chrome/android/BUILD.gn
index 83f6dc191ce61f8302dc9b8a214822acb688f1d7..76a03311b7a3cb6c6ed501f6e64e0d61b7492f03 100644
--- a/chrome/android/BUILD.gn
+++ b/chrome/android/BUILD.gn
@@ -280,6 +280,7 @@ android_library("chrome_java") {
     java_files += chrome_vr_java_sources
     deps += [ "//third_party/gvr-android-sdk:gvr_common_java" ]
   }
+  srcjar_deps += [ ":chrome_vr_android_java_enums_srcjar" ]
 
   # Add the actual implementation where necessary so that downstream targets
   # can provide their own implementations.
@@ -316,6 +317,12 @@ java_cpp_enum("chrome_android_java_enums_srcjar") {
   ]
 }
 
+java_cpp_enum("chrome_vr_android_java_enums_srcjar") {
+  sources = [
+    "//chrome/browser/android/vr_shell/vr_core_info.h",
+  ]
+}
+
 proto_java_library("document_tab_model_info_proto_java") {
   proto_path = "java/src/org/chromium/chrome/browser/tabmodel/document"
   sources = [