Adding basic Metro Print Metrics.

chrome/browser/printing/print_view_manager.cc

Index: chrome/browser/printing/print_view_manager.cc
diff --git a/chrome/browser/printing/print_view_manager.cc b/chrome/browser/printing/print_view_manager.cc
index 09213d26f3a1ffd03b000e6abdf733f59a8b5ebb..e8fce2e324d0343496070e86bd8343f92f3f3471 100644
--- a/chrome/browser/printing/print_view_manager.cc
+++ b/chrome/browser/printing/print_view_manager.cc
@@ -9,6 +9,7 @@
 #include "base/bind.h"
 #include "base/lazy_instance.h"
 #include "base/memory/scoped_ptr.h"
+#include "base/metrics/histogram.h"
 #include "base/timer.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/browser_process.h"
@@ -109,6 +110,9 @@ bool PrintViewManager::AdvancedPrintNow() {
 }
 
 bool PrintViewManager::PrintToDestination() {
+  // TODO(mad): Remove this once we can send user metrics from the metro driver.
+  // crbug.com/142330
+  UMA_HISTOGRAM_ENUMERATION("Metro.Print", 0, 2);

[Ilya Sherman, 2012/08/13 22:34:00]

nit: Please use named constants from an enum rather than fixed numbers.  The two
advantages of using enum constants are that (1) they're self documenting, and
(2) it's harder to get the number of buckets wrong due to a typo, especially if
you later decide to add additional metrics to this histogram.

   // TODO(mad): Use a passed in destination interface instead.
   g_browser_process->print_job_manager()->SetPrintDestination(
       printing::CreatePrintDestination());