Adds UMA histograms for desktop capture device.

content/browser/media/capture/desktop_capture_device_uma_types.h

Index: content/browser/media/capture/desktop_capture_device_uma_types.h
diff --git a/content/browser/media/capture/desktop_capture_device_uma_types.h b/content/browser/media/capture/desktop_capture_device_uma_types.h
new file mode 100644
index 0000000000000000000000000000000000000000..0994fcd31508e4c12a4dee48d62d67c1bbf0d24b
--- /dev/null
+++ b/content/browser/media/capture/desktop_capture_device_uma_types.h
@@ -0,0 +1,30 @@
+// 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.
+
+#ifndef CONTENT_BROWSER_MEDIA_CAPTURE_DESKTOP_CAPTURE_DEVICE_UMA_TYPES_H_
+#define CONTENT_BROWSER_MEDIA_CAPTURE_DESKTOP_CAPTURE_DEVICE_UMA_TYPES_H_
+
+namespace content {
+
+// This enum must be kept in-sync with DesktopCaptureCounters defined in
+// histograms.xml. New fields should be added right before
+// DESKTOP_CAPTURE_COUNTER_BOUNDARY.
+enum DesktopCaptureCounters {
+  SCREEN_CAPTURER_CREATED,
+  WINDOW_CATPTURER_CREATED,
+  FIRST_SCREEN_CAPTURE_SUCCEEDED,
+  FIRST_SCREEN_CAPTURE_FAILED,
+  FIRST_WINDOW_CAPTURE_SUCCEEDED,
+  FIRST_WINDOW_CAPTURE_FAILED,
+  DESKTOP_CAPTURE_COUNTER_BOUNDARY
+};
+
+extern const char kUmaScreenCaptureTime[];
+extern const char kUmaWindowCaptureTime[];
+
+void IncrementDesktopCaptureCounter(DesktopCaptureCounters counter);
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_MEDIA_CAPTURE_DESKTOP_CAPTURE_DEVICE_UMA_TYPES_H_