Record document mode histogram in UMA on every upload.

chrome/browser/android/feature_utilities.cc

Index: chrome/browser/android/feature_utilities.cc
diff --git a/chrome/browser/android/feature_utilities.cc b/chrome/browser/android/feature_utilities.cc
new file mode 100644
index 0000000000000000000000000000000000000000..39f55782addfa20a85d9c03a7ad72320200f38c7
--- /dev/null
+++ b/chrome/browser/android/feature_utilities.cc
@@ -0,0 +1,33 @@
+// 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 "chrome/browser/android/feature_utilities.h"
+
+#include "jni/FeatureUtilities_jni.h"
+
+namespace {
+bool document_mode_enabled = false;
+} // namespace
+
+namespace chrome {
+namespace android {
+
+RunningModeHistogram GetDocumentModeValue() {
+  return document_mode_enabled ? RUNNING_MODE_DOCUMENT_MODE :
+      RUNNING_MODE_TABBED_MODE;
+}
+
+} // namespace android
+} // namespace chrome
+
+
+static void SetDocumentModeEnabled(JNIEnv* env,
+                                   jclass clazz,
+                                   jboolean enabled) {
+  document_mode_enabled = enabled;
+}
+
+bool RegisterFeatureUtilities(JNIEnv* env) {
+  return RegisterNativesImpl(env);
+}