PDF: Add UMA to track successful / failed PDF loads

chrome/renderer/plugins/plugin_uma.cc

Index: chrome/renderer/plugins/plugin_uma.cc
diff --git a/chrome/renderer/plugins/plugin_uma.cc b/chrome/renderer/plugins/plugin_uma.cc
index 0aceead0d76a1286e9ed80c60c35aafa1e331766..b474cf63434e22d01b146afac10d84218030159f 100644
--- a/chrome/renderer/plugins/plugin_uma.cc
+++ b/chrome/renderer/plugins/plugin_uma.cc
@@ -79,6 +79,12 @@ void PluginUMAReporter::ReportPluginDisabled(
                                 GetPluginType(plugin_mime_type, plugin_src));
 }
 
+// static
+void PluginUMAReporter::ReportPDFLoadStatus(PDFLoadStatus status) {
+  UMA_HISTOGRAM_ENUMERATION("PDF.LoadStatus", status,
+                            PluginUMAReporter::PDF_LOAD_STATUS_MAX);
+}
+
 PluginUMAReporter::PluginUMAReporter() : report_sender_(new UMASenderImpl()) {}
 
 PluginUMAReporter::~PluginUMAReporter() {}