Fix CronetHttpURLConnectionTest#testServerHangsUp flake

components/cronet/android/test/src/org/chromium/net/NativeTestServer.java

Index: components/cronet/android/test/src/org/chromium/net/NativeTestServer.java
diff --git a/components/cronet/android/test/src/org/chromium/net/NativeTestServer.java b/components/cronet/android/test/src/org/chromium/net/NativeTestServer.java
index e6f5ef04884cf5e7c919b32f7e23f7c62c477096..38d9e072f8998c95514b31cf3aeea07137a2cea0 100644
--- a/components/cronet/android/test/src/org/chromium/net/NativeTestServer.java
+++ b/components/cronet/android/test/src/org/chromium/net/NativeTestServer.java
@@ -56,6 +56,11 @@ public final class NativeTestServer {
         return nativeGetSdchURL();
     }
 
+    // Returns a URL that server will keep sending client data.
+    public static String getInfiniteResponseURL() {
+        return nativeGetInfiniteResponseURL();
+    }
+
     // The following URLs will make NativeTestServer serve a response based on
     // the contents of the corresponding file and its mock-http-headers file.
 
@@ -92,6 +97,7 @@ public final class NativeTestServer {
     private static native String nativeGetRedirectToEchoBody();
     private static native String nativeGetFileURL(String filePath);
     private static native String nativeGetSdchURL();
+    private static native String nativeGetInfiniteResponseURL();
     private static native String nativeGetHostPort();
     private static native boolean nativeIsDataReductionProxySupported();
 }