Upstream changes to HttpUrlRequest for querying response headers and closing ReadableByteChannel.

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

Index: components/cronet/android/java/src/org/chromium/net/HttpUrlConnectionUrlRequest.java
diff --git a/components/cronet/android/java/src/org/chromium/net/HttpUrlConnectionUrlRequest.java b/components/cronet/android/java/src/org/chromium/net/HttpUrlConnectionUrlRequest.java
index 21ce9c94bf196dfd40d18dee435d17c47a51b28c..77492aeb0cea8637bb0175a72114320af5467bc7 100644
--- a/components/cronet/android/java/src/org/chromium/net/HttpUrlConnectionUrlRequest.java
+++ b/components/cronet/android/java/src/org/chromium/net/HttpUrlConnectionUrlRequest.java
@@ -221,6 +221,8 @@ class HttpUrlConnectionUrlRequest implements HttpUrlRequest {
                 return;
             }
 
+            mListener.onResponseStarted(this);
+
             mResponseStream = isError(mHttpStatusCode) ? mConnection
                     .getErrorStream()
                     : stream;
@@ -250,6 +252,14 @@ class HttpUrlConnectionUrlRequest implements HttpUrlRequest {
         } catch (IOException e) {
             mException = e;
         } finally {
+            if (mPostDataChannel != null) {
+                try {
+                    mPostDataChannel.close();
+                } catch (IOException e) {
+                    // Ignore
+                }
+            }
+
             // Don't call onRequestComplete yet if we are reading the response
             // on a separate thread
             if (!readingResponse) {
@@ -425,6 +435,15 @@ class HttpUrlConnectionUrlRequest implements HttpUrlRequest {
         return mContentType;
     }
 
+
+    @Override
+    public String getHeader(String name) {
+        if (mConnection == null) {
+            throw new IllegalStateException("Response headers not available");
+        }
+        return mConnection.getHeaderField(name);
+    }
+
     private void validateNotStarted() {
         if (mStarted) {
             throw new IllegalStateException("Request already started");