[Cronet] Enable persistence mode for Sdch

components/cronet/android/test/src/org/chromium/net/SdchObserver.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 org.chromium.base.CalledByNative;
+import org.chromium.base.JNINamespace;
+
+/**
+ * Class to watch for Sdch dictionary events. The native implementation
+ * unregisters itself when an event happens. Therefore, an instance of this
+ * class is only able to receive a notification of the earliest event.
+ * Currently, implemented events include {@link #onDictionaryAdded}.
+ */
+@JNINamespace("cronet")
+public class SdchObserver {
+    protected boolean mDictionaryAlreadyPresent = false;
+    private final ConditionVariable mAddBlock = new ConditionVariable();
+
+    /**
+     * Constructor.
+     * @param targetUrl the target url on which sdch encoding will be used.
+     * @param contextAdapter the native context adapter to register the observer.
+     * @param isLegacyApi whether legacy api is used.
+     */
+    public SdchObserver(String targetUrl, long contextAdapter, boolean isLegacyAPI) {
+        if (isLegacyAPI) {
+            nativeAddSdchObserverLegacyAPI(targetUrl, contextAdapter);
+        } else {
+            nativeAddSdchObserver(targetUrl, contextAdapter);
+        }
+        mAddBlock.block();
+        mAddBlock.close();
+    }
+
+    /**
+     * Called when a dictionary is added to the SdchManager for the target url.
+     * Override this method if caller would like to get notified.
+     */
+    @CalledByNative
+    public void onDictionaryAdded() {
+        // Left blank;
+    }
+
+    @CalledByNative
+    private void onAddSdchObserverCompleted() {
+        mAddBlock.open();
+    }
+
+    @CalledByNative
+    private void onDictionarySetAlreadyPresent() {
+        mDictionaryAlreadyPresent = true;
+        mAddBlock.open();
+    }
+
+    private native void nativeAddSdchObserver(String targetUrl, long contextAdapter);
+    private native void nativeAddSdchObserverLegacyAPI(String targetUrl, long contextAdapter);
+}