am 893056c6: am e38212a2: Overlay could not set position or rotation immediately after created, it should be triggered by signalEvent(). Originally from: https://partner.source.android.com/g/#change,1074

Merge commit '893056c636c705f04cd44643017fc84c0d981df2'

* commit '893056c636c705f04cd44643017fc84c0d981df2':
  Overlay could not set position or rotation immediately after created, it should be triggered by signalEvent().

libs/surfaceflinger/LayerBuffer.cpp

@@ -595,6 +595,7 @@ LayerBuffer::OverlaySource::OverlaySource(LayerBuffer& layer,
 
     *overlayRef = new OverlayRef(mOverlayHandle, channel,
             mWidth, mHeight, mFormat, mWidthStride, mHeightStride);
+    mLayer.mFlinger->signalEvent();
 }
 
 LayerBuffer::OverlaySource::~OverlaySource()