Install a hook to swap between SkPicture backends with a single define.

gm/optimizations.cpp

Index: gm/optimizations.cpp
diff --git a/gm/optimizations.cpp b/gm/optimizations.cpp
index d810420f0a00943f617418a7a0c8581e8174550d..a33f45711f9f3117aac343e46c390da611a062aa 100644
--- a/gm/optimizations.cpp
+++ b/gm/optimizations.cpp
@@ -82,7 +82,7 @@ static SkPicture* create_save_layer_opt_1(SkTDArray<DrawType>* preOptPattern,
 
     SkPictureRecorder recorder;
 
-    SkCanvas* canvas = recorder.beginRecording(100, 100, NULL, 0);
+    SkCanvas* canvas = recorder.DEPRECATED_beginRecording(100, 100, NULL, 0);
     // have to disable the optimizations while generating the picture
     recorder.internalOnly_EnableOpts(false);
 
@@ -216,7 +216,7 @@ static SkPicture* create_save_layer_opt_2(SkTDArray<DrawType>* preOptPattern,
 
     SkPictureRecorder recorder;
 
-    SkCanvas* canvas = recorder.beginRecording(100, 100, NULL, 0);
+    SkCanvas* canvas = recorder.DEPRECATED_beginRecording(100, 100, NULL, 0);
     // have to disable the optimizations while generating the picture
     recorder.internalOnly_EnableOpts(false);
 
@@ -359,7 +359,8 @@ protected:
             // re-render the 'pre' picture and thus 'apply' the optimization
             SkPictureRecorder recorder;
 
-            SkCanvas* recordCanvas = recorder.beginRecording(pre->width(), pre->height(), NULL, 0);
+            SkCanvas* recordCanvas =
+                recorder.DEPRECATED_beginRecording(pre->width(), pre->height(), NULL, 0);
 
             pre->draw(recordCanvas);