Record document mode histogram in UMA on every upload.

chrome/browser/android/feature_utilities.h

Index: chrome/browser/android/feature_utilities.h
diff --git a/chrome/browser/android/feature_utilities.h b/chrome/browser/android/feature_utilities.h
new file mode 100644
index 0000000000000000000000000000000000000000..bb3b7dc18b366be9cc49a4c9b700651cadb00f87
--- /dev/null
+++ b/chrome/browser/android/feature_utilities.h
@@ -0,0 +1,26 @@
+// 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 CHROME_BROWSER_ANDROID_FEATURE_UTILITIES_H_
+#define CHROME_BROWSER_ANDROID_FEATURE_UTILITIES_H_
+
+#include <jni.h>
+
+namespace chrome {
+namespace android {
+
+enum RunningModeHistogram {
+  RUNNING_MODE_DOCUMENT_MODE,
+  RUNNING_MODE_TABBED_MODE,
+  RUNNING_MODE_MAX
+};
+
+RunningModeHistogram GetDocumentModeValue();
+
+} // namespace android
+} // namespace chrome
+
+bool RegisterFeatureUtilities(JNIEnv* env);
+
+#endif  // CHROME_BROWSER_ANDROID_FEATURE_UTILITIES_H_