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/CanvasState.h b/libs/hwui/CanvasState.h
index 121112b..4db5ed2 100644
--- a/libs/hwui/CanvasState.h
+++ b/libs/hwui/CanvasState.h
@@ -51,7 +51,7 @@
      * Allows subclasses to control what value is stored in snapshot's
      * fbo field in * initializeSaveStack.
      */
-    virtual GLuint onGetTargetFbo() const = 0;
+    virtual GLuint getTargetFbo() const = 0;
 
 }; // class CanvasStateClient