base

Fix uninitialized member warning

The fact that mHasDeferredTranslate was unitialized couldn't cause any
problems, since mTranslateX and mTranslateY are intialized to zero and
the only use of mHasDeferredTranslate, in
DisplayListRenderer::flushTranslate(), doesn't do anything if those
values are both zero and then sets mHasDeferredTranslate to false.

Change-Id: Ia5aa2590b3ab956eaf74c90515353600253873f5