Adds UMA histograms for desktop capture device.

content/browser/media/capture/desktop_capture_device_uma_types.cc

Index: content/browser/media/capture/desktop_capture_device_uma_types.cc
diff --git a/content/browser/media/capture/desktop_capture_device_uma_types.cc b/content/browser/media/capture/desktop_capture_device_uma_types.cc
new file mode 100644
index 0000000000000000000000000000000000000000..c91641c5336f6c50bb1825d9f2dec365c11c2623
--- /dev/null
+++ b/content/browser/media/capture/desktop_capture_device_uma_types.cc
@@ -0,0 +1,20 @@
+// Copyright 2014 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 "content/browser/media/capture/desktop_capture_device_uma_types.h"
+
+#include "base/metrics/histogram.h"
+
+namespace content {
+
+const char kUmaScreenCaptureTime[] = "WebRTC.ScreenCaptureTime";
+const char kUmaWindowCaptureTime[] = "WebRTC.WindowCaptureTime";
+
+void IncrementDesktopCaptureCounter(DesktopCaptureCounters counter) {
+  UMA_HISTOGRAM_ENUMERATION("WebRTC.DesktopCaptureCounters",
+                            counter,
+                            DESKTOP_CAPTURE_COUNTER_BOUNDARY);
+}
+
+}  // namespace content