[3171580] don't automatically log GraphicBuffer allocation failures

some of these failures are not fatal and even expected in some cases
so they should not emit a dump in the log in those cases.

Change-Id: Idcfa252e3bfa9d74e27fe4ad8f8623aa01aa9c5e
diff --git a/services/surfaceflinger/Layer.cpp b/services/surfaceflinger/Layer.cpp
index a060d31..5018fb3 100644
--- a/services/surfaceflinger/Layer.cpp
+++ b/services/surfaceflinger/Layer.cpp
@@ -347,6 +347,7 @@
     err = buffer->initCheck();
 
     if (err || buffer->handle == 0) {
+        GraphicBuffer::dumpAllocationsToSystemLog();
         LOGE_IF(err || buffer->handle == 0,
                 "Layer::requestBuffer(this=%p), index=%d, w=%d, h=%d failed (%s)",
                 this, index, w, h, strerror(-err));