Add UMA stats for new Print Preview UI elements.
BUG=397741
Review URL: https://codereview.chromium.org/601573002
Cr-Commit-Position: refs/heads/master@{#296552}
diff --git a/printing/print_job_constants.cc b/printing/print_job_constants.cc
index ed4d1e2..8d36199 100644
--- a/printing/print_job_constants.cc
+++ b/printing/print_job_constants.cc
@@ -95,6 +95,9 @@
// Key that specifies the requested media platform specific vendor id.
const char kSettingMediaSizeVendorId[] = "vendor_id";
+// Key that specifies whether the requested media is a default one.
+const char kSettingMediaSizeIsDefault[] = "is_default";
+
// Key that specifies the bottom margin of the page.
const char kSettingMarginBottom[] = "marginBottom";
