Implement TODO(romainguy)

 Bug: 14277445

Change-Id: Id52d6f7fcc023000adcc440bd4da67d9a673536b
diff --git a/libs/hwui/renderthread/CanvasContext.cpp b/libs/hwui/renderthread/CanvasContext.cpp
index fc3548c..dd78c62 100644
--- a/libs/hwui/renderthread/CanvasContext.cpp
+++ b/libs/hwui/renderthread/CanvasContext.cpp
@@ -385,6 +385,10 @@
     mCanvas->setViewport(width, height);
 }
 
+void CanvasContext::setOpaque(bool opaque) {
+    mOpaque = opaque;
+}
+
 void CanvasContext::makeCurrent() {
     // TODO: Figure out why this workaround is needed, see b/13913604
     // In the meantime this matches the behavior of GLRenderer, so it is not a regression