Introduce ThreadedInputConnection behind a switch

content/public/android/java/src/org/chromium/content/browser/input/InputMethodUma.java

+// Copyright 2016 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.
+
+package org.chromium.content.browser.input;
+
+import org.chromium.base.metrics.RecordHistogram;
+
+/**
+ * A class to record various input method UMAs.
+ */
+class InputMethodUma {
+    // Note that these values should be cross-checked against
+    // tools/metrics/histograms/histograms.xml.
+    private static final String UMA_REGISTER_PROXYVIEW = "InputMethod.RegisterProxyView";
+    private static final int UMA_PROXYVIEW_SUCCESS = 0;
+    private static final int UMA_PROXYVIEW_FAILURE = 1;
+    private static final int UMA_PROXYVIEW_DETECTION_FAILURE = 2;
+    private static final int UMA_PROXYVIEW_REPLICA_INPUT_CONNECTION = 3;
+    private static final int UMA_PROXYVIEW_COUNT = 4;
+
+    void recordProxyViewSuccess() {
+        RecordHistogram.recordEnumeratedHistogram(
+                UMA_REGISTER_PROXYVIEW, UMA_PROXYVIEW_SUCCESS, UMA_PROXYVIEW_COUNT);
+    }
+
+    void recordProxyViewFailure() {
+        RecordHistogram.recordEnumeratedHistogram(
+                UMA_REGISTER_PROXYVIEW, UMA_PROXYVIEW_FAILURE, UMA_PROXYVIEW_COUNT);
+    }
+
+    void recordProxyViewDetectionFailure() {
+        RecordHistogram.recordEnumeratedHistogram(
+                UMA_REGISTER_PROXYVIEW, UMA_PROXYVIEW_DETECTION_FAILURE, UMA_PROXYVIEW_COUNT);
+    }
+
+    void recordProxyViewReplicaInputConnection() {
+        RecordHistogram.recordEnumeratedHistogram(UMA_REGISTER_PROXYVIEW,
+                UMA_PROXYVIEW_REPLICA_INPUT_CONNECTION, UMA_PROXYVIEW_COUNT);
+    }
+}