[Cronet] Separate Cronet implementation and API by package name.

components/cronet/android/java/src/org/chromium/net/impl/CronetBidirectionalStream.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;
+package org.chromium.net.impl;
 
 import org.chromium.base.Log;
 import org.chromium.base.VisibleForTesting;
 import org.chromium.base.annotations.CalledByNative;
 import org.chromium.base.annotations.JNINamespace;
 import org.chromium.base.annotations.NativeClassQualifiedName;
+import org.chromium.net.BidirectionalStream;
+import org.chromium.net.CronetException;
+import org.chromium.net.Preconditions;
+import org.chromium.net.QuicException;
+import org.chromium.net.RequestPriority;
+import org.chromium.net.UrlRequestException;
+import org.chromium.net.UrlResponseInfo;
 
 import java.nio.ByteBuffer;
 import java.util.AbstractMap;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.LinkedList;
 import java.util.List;
 import java.util.Map;
 import java.util.concurrent.Executor;
 import java.util.concurrent.RejectedExecutionException;
 
 import javax.annotation.concurrent.GuardedBy;
 
 /**
  * {@link BidirectionalStream} implementation using Chromium network stack.
  * All @CalledByNative methods are called on the native network thread
  * and post tasks with callback calls onto Executor. Upon returning from callback, the native
  * stream is called on Executor thread and posts native tasks to the native network thread.
  */
 @JNINamespace("cronet")
-class CronetBidirectionalStream extends BidirectionalStream {
+@VisibleForTesting
+public class CronetBidirectionalStream extends BidirectionalStream {
     /**
      * States of BidirectionalStream are tracked in mReadState and mWriteState.
      * The write state is separated out as it changes independently of the read state.
      * There is one initial state: State.NOT_STARTED. There is one normal final state:
      * State.SUCCESS, reached after State.READING_DONE and State.WRITING_DONE. There are two
      * exceptional final states: State.CANCELED and State.ERROR, which can be reached from
      * any other non-final state.
      */
     private enum State {
         /* Initial state, stream not started. */
@@ skipping 715 matching lines @@
     private native boolean nativeReadData(
             long nativePtr, ByteBuffer byteBuffer, int position, int limit);
 
     @NativeClassQualifiedName("CronetBidirectionalStreamAdapter")
     private native boolean nativeWritevData(long nativePtr, ByteBuffer[] buffers, int[] positions,
             int[] limits, boolean endOfStream);
 
     @NativeClassQualifiedName("CronetBidirectionalStreamAdapter")
     private native void nativeDestroy(long nativePtr, boolean sendOnCanceled);
 }