Revert "Revert "Upload screennails in tiles to prevent jank""

This reverts commit ad7cf187bf0c11b05aa3eab7085148e0353f2af5.

bug: 6399444
Change-Id: I94b286ab3e0db21c582cbfa9183489613da30edb
diff --git a/tests/src/com/android/gallery3d/ui/GLCanvasStub.java b/tests/src/com/android/gallery3d/ui/GLCanvasStub.java
index 2f2d753..5a08b85 100644
--- a/tests/src/com/android/gallery3d/ui/GLCanvasStub.java
+++ b/tests/src/com/android/gallery3d/ui/GLCanvasStub.java
@@ -83,4 +83,6 @@
     public void dumpStatisticsAndClear() {}
     public void beginRenderTarget(RawTexture texture) {}
     public void endRenderTarget() {}
+    public void drawMixed(BasicTexture from, int toColor,
+            float ratio, RectF src, RectF target) {}
 }