Eager or Lazy evaluation of sub-drawings for SkDeferredCanvas.

Allow evaluation choice of Lazy or Eager evaluation for SkDeferredCanvas.

Eager is used for drawing to a non-recording canvas to reduce the number of
all operations.

Lazy is used for drawing to a recording canvas to reduce the amount decode/encode
that happens.

R=reed@google.com

Change-Id: I7837c4f6e5911c153e0796162e1170edbc34839e
Reviewed-on: https://skia-review.googlesource.com/9839
Commit-Queue: Herb Derby <herb@google.com>
Reviewed-by: Mike Reed <reed@google.com>
diff --git a/tests/CanvasTest.cpp b/tests/CanvasTest.cpp
index f6b275f..cfdce62 100644
--- a/tests/CanvasTest.cpp
+++ b/tests/CanvasTest.cpp
@@ -741,7 +741,7 @@
     SkDebugfDumper dumper;
     SkDumpCanvas dumpC(&dumper);
 
-    SkDeferredCanvas canvas(&dumpC);
+    SkDeferredCanvas canvas(&dumpC, SkDeferredCanvas::kEager);
 
     SkPaint paint;
 //    paint.setShader(SkShader::MakeColorShader(SK_ColorRED));