Tracks GVR version crossed with headset type using UMA.

chrome/browser/android/vr_shell/vr_shell_gl.cc

Index: chrome/browser/android/vr_shell/vr_shell_gl.cc
diff --git a/chrome/browser/android/vr_shell/vr_shell_gl.cc b/chrome/browser/android/vr_shell/vr_shell_gl.cc
index a666358aa36155ced534943352afdef5f1e9d985..c48e292dcfeb9cc0f06af7d8789b346557523078 100644
--- a/chrome/browser/android/vr_shell/vr_shell_gl.cc
+++ b/chrome/browser/android/vr_shell/vr_shell_gl.cc
@@ -22,8 +22,10 @@
 #include "chrome/browser/android/vr_shell/vr_controller.h"
 #include "chrome/browser/android/vr_shell/vr_gl_thread.h"
 #include "chrome/browser/android/vr_shell/vr_gl_util.h"
+#include "chrome/browser/android/vr_shell/vr_metrics_util.h"
 #include "chrome/browser/android/vr_shell/vr_shell.h"
 #include "chrome/browser/android/vr_shell/vr_shell_renderer.h"
+#include "chrome/browser/android/vr_shell/vr_usage_monitor.h"
 #include "device/vr/android/gvr/gvr_delegate.h"
 #include "device/vr/android/gvr/gvr_device.h"
 #include "device/vr/android/gvr/gvr_gamepad_data_provider.h"
@@ -150,12 +152,6 @@ std::unique_ptr<blink::WebMouseEvent> MakeMouseEvent(WebInputEvent::Type type,
   return mouse_event;
 }
 
-enum class ViewerType {
-  UNKNOWN_TYPE = 0,
-  CARDBOARD = 1,
-  DAYDREAM = 2,
-  VIEWER_TYPE_MAX,
-};
 
 void MatfToGvrMat(const vr::Mat4f& in, gvr::Mat4f* out) {
   // If our std::array implementation doesn't have any non-data members, we can
@@ -405,21 +401,7 @@ void VrShellGl::GvrInit(gvr_context* gvr_api) {
   gvr_api_ = gvr::GvrApi::WrapNonOwned(gvr_api);
   controller_.reset(new VrController(gvr_api));
 
-  ViewerType viewerType;
-  switch (gvr_api_->GetViewerType()) {
-    case gvr::ViewerType::GVR_VIEWER_TYPE_DAYDREAM:
-      viewerType = ViewerType::DAYDREAM;
-      break;
-    case gvr::ViewerType::GVR_VIEWER_TYPE_CARDBOARD:
-      viewerType = ViewerType::CARDBOARD;
-      break;
-    default:
-      NOTREACHED();
-      viewerType = ViewerType::UNKNOWN_TYPE;
-      break;
-  }
-  UMA_HISTOGRAM_ENUMERATION("VRViewerType", static_cast<int>(viewerType),
-                            static_cast<int>(ViewerType::VIEWER_TYPE_MAX));
+  VrMetricsUtil::LogVrViewerType(gvr_api);
 }
 
 void VrShellGl::InitializeRenderer() {