Expose a Java API for base/feature_list.h.

chrome/android/java/src/org/chromium/chrome/browser/ChromeFeatureList.java

+// Copyright 2015 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.chrome.browser;
+
+import org.chromium.base.annotations.MainDex;
+
+/**
+ * Java accessor for base/feature_list.h state.
+ */
+@MainDex
+public abstract class ChromeFeatureList {

[nyquist, 2015/12/18 22:49:22]

I don't really get why this is in //chrome and not //base?

[Alexei Svitkine (slow), 2015/12/18 22:54:45]

Chatted with nyquist@ offline, but the answer is that the .cc code may need
access to features define in chrome/, components/, etc and thus can't be in
base.

+    // Prevent instantiation.
+    private ChromeFeatureList() {}
+
+    /**
+     * Returns whether the specified feature is enabled or not.
+     *
+     * Note: Features queried through this API must be added to the array
+     * |kFeaturesExposedToJava| in chrome/browser/android/chrome_feature_list.cc
+     *
+     * @param featureName The name of the feature to query.
+     * @return Whether the feature is enabled or not.
+     */
+    public static boolean isEnabled(String featureName) {
+        return nativeIsEnabled(featureName);
+    }
+
+    private static native boolean nativeIsEnabled(String featureName);
+}