Add new Cronet exception class for QUIC errors

components/cronet/android/api/src/org/chromium/net/UrlRequestException.java

Index: components/cronet/android/api/src/org/chromium/net/UrlRequestException.java
diff --git a/components/cronet/android/api/src/org/chromium/net/UrlRequestException.java b/components/cronet/android/api/src/org/chromium/net/UrlRequestException.java
index 92201aa32471128ce721a81cab80fbf8b061f73b..90ac3dd9c89265180d5213e68bbb9818ec20deb4 100644
--- a/components/cronet/android/api/src/org/chromium/net/UrlRequestException.java
+++ b/components/cronet/android/api/src/org/chromium/net/UrlRequestException.java
@@ -14,7 +14,9 @@ import java.io.IOException;
  *     {@link #getErrorCode} will return {@link #ERROR_LISTENER_EXCEPTION_THROWN}.
  * <li>Cronet fails to process a network request. In this case
  *     {@link #getErrorCode} and {@link #getCronetInternalErrorCode} can be used to get more
- *     information about the specific type of failure.
+ *     information about the specific type of failure. If {@link #getCronetInternalErrorCode}
+ *     returns {@link #QUIC_PROTOCOL_ERROR}, this exception can be cast to a {@link QuicException}
+ *     which can provide further details.
  * </ul>
  */
 public class UrlRequestException extends IOException {
@@ -69,6 +71,13 @@ public class UrlRequestException extends IOException {
      */
     public static final int ERROR_OTHER = UrlRequestError.OTHER;
 
+    /**
+     * Error code indicating an error during a QUIC connection. Unlike the ERROR_* constants, this
+     * will appear as a return value from {@link #getCronetInternalErrorCode}, not
+     * {@link #getErrorCode}.
+     */
+    public static final int QUIC_PROTOCOL_ERROR = -356;

[xunjieli, 2016/06/30 14:13:43]

We can just reuse NetError.ERR_QUIC_PROTOCOL_ERROR.

[mgersh, 2016/06/30 16:50:53]

Done.

+
     // Error code, one of ERROR_*
     private final int mErrorCode;
     // Cronet internal error code.