Add SetSupportsQuic method to explicitly specify server that supports QUIC.

components/cronet/android/java/src/org/chromium/net/ChromiumUrlRequest.java

Index: components/cronet/android/java/src/org/chromium/net/ChromiumUrlRequest.java
diff --git a/components/cronet/android/java/src/org/chromium/net/ChromiumUrlRequest.java b/components/cronet/android/java/src/org/chromium/net/ChromiumUrlRequest.java
index ed448f2571c11bd8f5b0ca07db29f160f7ece931..41e3cf2937e74eac28a82eba47697a2139d0c823 100644
--- a/components/cronet/android/java/src/org/chromium/net/ChromiumUrlRequest.java
+++ b/components/cronet/android/java/src/org/chromium/net/ChromiumUrlRequest.java
@@ -390,17 +390,26 @@ public class ChromiumUrlRequest implements HttpUrlRequest {
         }
     }
 
+    @Override
+    public String getNegotiatedProtocol() {
+        validateNotRecycled();
+        validateHeadersAvailable();
+        return nativeGetNegotiatedProtocol(mUrlRequestAdapter);
+    }
+
     public String getContentType() {
         return mContentType;
     }
 
     public String getHeader(String name) {
+        validateNotRecycled();
         validateHeadersAvailable();
         return nativeGetHeader(mUrlRequestAdapter, name);
     }
 
     // All response headers.
     public Map<String, List<String>> getAllHeaders() {
+        validateNotRecycled();
         validateHeadersAvailable();
         ResponseHeadersMap result = new ResponseHeadersMap();
         nativeGetAllHeaders(mUrlRequestAdapter, result);
@@ -687,6 +696,8 @@ public class ChromiumUrlRequest implements HttpUrlRequest {
     private native void nativeGetAllHeaders(long urlRequestAdapter,
             ResponseHeadersMap headers);
 
+    private native String nativeGetNegotiatedProtocol(long urlRequestAdapter);
+
     // Explicit class to work around JNI-generator generics confusion.
     private class ResponseHeadersMap extends HashMap<String, List<String>> {
     }