Expose startNetLog / stopNetLog from HttpUrlRequestFactory.

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

Index: components/cronet/android/java/src/org/chromium/net/HttpUrlRequestFactory.java
diff --git a/components/cronet/android/java/src/org/chromium/net/HttpUrlRequestFactory.java b/components/cronet/android/java/src/org/chromium/net/HttpUrlRequestFactory.java
index a500fd7f3510781bda33ec093190f29d01ed104a..2e53504ad29d99742a8f05bcee0acbc299098df0 100644
--- a/components/cronet/android/java/src/org/chromium/net/HttpUrlRequestFactory.java
+++ b/components/cronet/android/java/src/org/chromium/net/HttpUrlRequestFactory.java
@@ -59,6 +59,22 @@ public abstract class HttpUrlRequestFactory {
             int requestPriority, Map<String, String> headers,
             WritableByteChannel channel, HttpUrlRequestListener listener);
 
+    /**
+     * Starts NetLog logging to a file named |fileName| in the
+     * application temporary directory. |fileName| must not be empty. Log level
+     * is LOG_ALL_BUT_BYTES. If the file exists it is truncated before starting.
+     * If actively logging the call is ignored.
+     */
+    public void startNetLogToFile(String fileName) {

[xunjieli, 2014/09/26 18:22:45]

Empty functions here look a little weird. Can we make them abstract or throw
unimplemented exception? 

[mef, 2014/09/26 18:33:49]

Done.

+    }
+
+    /**
+     * Stops NetLog logging and flushes file to disk. If a logging session is
+     * not in progress this call is ignored.
+     */
+    public void stopNetLog() {
+    }
+
     private static HttpUrlRequestFactory createChromiumFactory(
             Context context, HttpUrlRequestFactoryConfig config) {
         HttpUrlRequestFactory factory = null;