Adding basic Metro Print Metrics.

chrome/browser/printing/print_view_manager.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/printing/print_view_manager.h"
 
 #include <map>
 
 #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"
 #include "chrome/browser/printing/print_error_dialog.h"
 #include "chrome/browser/printing/print_job.h"
 #include "chrome/browser/printing/print_job_manager.h"
 #include "chrome/browser/printing/print_preview_tab_controller.h"
 #include "chrome/browser/printing/print_view_manager_observer.h"
 #include "chrome/browser/printing/printer_query.h"
 #include "chrome/browser/profiles/profile.h"
@@ skipping 80 matching lines @@
     PrintPreviewUI* print_preview_ui = static_cast<PrintPreviewUI*>(
         print_preview_tab->web_contents()->GetWebUI()->GetController());
     print_preview_ui->OnShowSystemDialog();
     return true;
   } else {
     return PrintNow();
   }
 }
 
 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());
   return PrintNowInternal(new PrintMsg_PrintPages(routing_id()));
 }
 
 bool PrintViewManager::PrintPreviewNow() {
   if (print_preview_state_ != NOT_PREVIEWING) {
     NOTREACHED();
     return false;
@@ skipping 529 matching lines @@
   scoped_refptr<printing::PrinterQuery> printer_query;
   print_job_manager->PopPrinterQuery(cookie, &printer_query);
   if (!printer_query.get())
     return;
   BrowserThread::PostTask(
       BrowserThread::IO, FROM_HERE,
       base::Bind(&PrinterQuery::StopWorker, printer_query.get()));
 }
 
 }  // namespace printing