[Cronet] Enable persistence mode for Sdch

components/cronet/android/test/src/org/chromium/net/SdchTestUtil.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.net;
+
+import android.os.ConditionVariable;
+
+import static junit.framework.Assert.assertEquals;
+import static junit.framework.Assert.assertNull;
+
+import org.chromium.base.CalledByNative;
+import org.chromium.base.JNINamespace;
+
+/**
+ * Test utilities related to Sdch.
+ */
+@JNINamespace("cronet")
+public final class SdchTestUtil {
+    // Blocks until the native SdchObserver is added or removed.
+    private static final ConditionVariable sAddRemoveBlock = new ConditionVariable();
+
+    /**
+     * Abstract class to listen for callbacks of the native SdchObserver.
+     */
+    public abstract static class SdchObserverCallback {
+        /**
+         * Called when a dictionary is added to the SdchManager.
+         * @param url the url of the dictionary added.
+         */
+        public abstract void onDictionaryAdded(String url);
+    }
+
+    private static SdchObserverCallback sCallback;
+
+    public static void registerSdchObserverCallback(
+            long contextAdapter, SdchObserverCallback callback, boolean isLegacyAPI) {
+        assertNull(sCallback);
+        sCallback = callback;
+        nativeAddRemoveSdchObserver(contextAdapter, isLegacyAPI, true /** add */);
+        sAddRemoveBlock.block();
+        sAddRemoveBlock.close();
+    }
+
+    public static void unregisterSdchObserverCallback(
+            long contextAdapter, SdchObserverCallback callback, boolean isLegacyAPI) {
+        assertEquals(sCallback, callback);
+        sCallback = null;
+        nativeAddRemoveSdchObserver(contextAdapter, isLegacyAPI, false /** add */);
+        sAddRemoveBlock.block();
+        sAddRemoveBlock.close();
+    }
+
+    @CalledByNative
+    private static void onDictionaryAdded(String dictionaryURL) {
+        if (sCallback != null) {
+            sCallback.onDictionaryAdded(dictionaryURL);
+        }
+    }
+
+    @CalledByNative
+    private static void onAddRemoveSdchObserverCompleted() {
+        sAddRemoveBlock.open();
+    }
+
+    private static native void nativeAddRemoveSdchObserver(
+            long contextAdapter, boolean isLegacyAPI, boolean add);
+}