Remove a misleading "flush" function.

This patch removes LocalSocketImpl.flush().  In practice this function
was simply a wrapper around `Thread.sleep(10)`.  All direct calls to
this function have been removed.  The `flush()` function is still called
on several objects that wrap a SocketOutputStream.

This will make booting a device 20ms faster than it currently is.

Bug: 139192244
Test: Build -> flash -> boot -> launch app
Change-Id: I0a96f4bc72461670370f61e847349f32af5ac774

1 files changed, 0 insertions, 14 deletions

diff --git a/framework/java/android/bluetooth/BluetoothSocket.java b/framework/java/android/bluetooth/BluetoothSocket.java
index a6e3153d6a..760166bfcc 100644
--- a/framework/java/android/bluetooth/BluetoothSocket.java
+++ b/framework/java/android/bluetooth/BluetoothSocket.java
@@ -515,20 +515,6 @@ public final class BluetoothSocket implements Closeable {
         return mSocketIS.available();
     }
 
-    /**
-     * Wait until the data in sending queue is emptied. A polling version
-     * for flush implementation. Used to ensure the writing data afterwards will
-     * be packed in new RFCOMM frame.
-     *
-     * @throws IOException if an i/o error occurs.
-     */
-    @UnsupportedAppUsage
-    /*package*/ void flush() throws IOException {
-        if (mSocketOS == null) throw new IOException("flush is called on null OutputStream");
-        if (VDBG) Log.d(TAG, "flush: " + mSocketOS);
-        mSocketOS.flush();
-    }
-
     /*package*/ int read(byte[] b, int offset, int length) throws IOException {
         int ret = 0;
         if (VDBG) Log.d(TAG, "read in:  " + mSocketIS + " len: " + length);