Update layers to clear them Bug #8489505
Update layers to clear them
Bug #8489505

A layer should be updated even with an empty deferred display list. It is
possible for a layer to request an update just to execute a clear which
will be handled by LayerRenderer::prepareDirty().

Change-Id: Iffb98bd71d6caa8d4a701df98197676f9423c0c2

xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base