Fix glop rendering within unclipped saveLayers

bug:19541881

Additionally, clean up GlopBuilders
and rename onGetSnapshot() for clarity

Change-Id: I0303e4cd61eef87cf80af2d968c4aa67193cd008
diff --git a/libs/hwui/LayerRenderer.cpp b/libs/hwui/LayerRenderer.cpp
index 30ffcea..1326206 100644
--- a/libs/hwui/LayerRenderer.cpp
+++ b/libs/hwui/LayerRenderer.cpp
@@ -93,7 +93,7 @@
     return retval;
 }
 
-GLuint LayerRenderer::onGetTargetFbo() const {
+GLuint LayerRenderer::getTargetFbo() const {
     return mLayer->getFbo();
 }