Allow direct executors in cronet.

components/cronet/android/java/src/org/chromium/net/impl/CronetUploadDataStream.java

Index: components/cronet/android/java/src/org/chromium/net/impl/CronetUploadDataStream.java
diff --git a/components/cronet/android/java/src/org/chromium/net/impl/CronetUploadDataStream.java b/components/cronet/android/java/src/org/chromium/net/impl/CronetUploadDataStream.java
index 3b2601e61fc1aabdd14c754bdd8d77b72b7b6b3d..19ea9cc9abfe9d317e26a0165a8921791ce8e17a 100644
--- a/components/cronet/android/java/src/org/chromium/net/impl/CronetUploadDataStream.java
+++ b/components/cronet/android/java/src/org/chromium/net/impl/CronetUploadDataStream.java
@@ -306,20 +306,28 @@ public final class CronetUploadDataStream implements UploadDataSink {
      * No native calls to urlRequest are allowed as this is done before request
      * start, so native object may not exist.
      */
-    void initializeWithRequest(final CronetUrlRequest urlRequest) {
+    void initializeWithRequest(final CronetUrlRequest urlRequest, final Runnable callback) {
         synchronized (mLock) {
             mRequest = urlRequest;
-            mInWhichUserCallback = UserCallback.GET_LENGTH;
-        }
-        try {
-            mLength = mDataProvider.getLength();
-            mRemainingLength = mLength;
-        } catch (Throwable t) {
-            onError(t);
-        }
-        synchronized (mLock) {
-            mInWhichUserCallback = UserCallback.NOT_IN_CALLBACK;
         }
+        postTaskToExecutor(new Runnable() {

[mef, 2016/08/30 16:29:45]

this is already on executor thread, why do you need to post?

[Charles, 2016/08/30 20:11:06]

It's not on the executor thread any more.

[mef, 2016/08/31 17:26:52]

Acknowledged. Please update comment.

[Charles, 2016/08/31 19:08:36]

Done.

+            @Override
+            public void run() {
+                synchronized (mLock) {
+                    mInWhichUserCallback = UserCallback.GET_LENGTH;
+                }
+                try {
+                    mLength = mDataProvider.getLength();
+                    mRemainingLength = mLength;
+                } catch (Throwable t) {
+                    onError(t);
+                }
+                synchronized (mLock) {
+                    mInWhichUserCallback = UserCallback.NOT_IN_CALLBACK;
+                }
+                callback.run();
+            }
+        });
     }
 
     /**