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

tests/CanvasTest.cpp

Index: tests/CanvasTest.cpp
diff --git a/tests/CanvasTest.cpp b/tests/CanvasTest.cpp
index 217cf0349e4751dfc883758bb4e808a25fe3286f..5d6a8d8a6fff09563d9350c8cb64ce9301edc30d 100644
--- a/tests/CanvasTest.cpp
+++ b/tests/CanvasTest.cpp
@@ -687,13 +687,13 @@ public:
         // are flattened during the second execution
         testStep->setAssertMessageFormat(kPictureDrawAssertMessageFormat);
         SkPictureRecorder referenceRecorder;
-        SkCanvas* referenceCanvas = referenceRecorder.beginRecording(kWidth, kHeight,
-                                                                     NULL, recordFlags);
+        SkCanvas* referenceCanvas =
+            referenceRecorder.DEPRECATED_beginRecording(kWidth, kHeight, NULL, recordFlags);
         testStep->draw(referenceCanvas, reporter);
 
         SkPictureRecorder testRecorder;
-        SkCanvas* testCanvas = testRecorder.beginRecording(kWidth, kHeight,
-                                                           NULL, recordFlags);
+        SkCanvas* testCanvas =
+            testRecorder.DEPRECATED_beginRecording(kWidth, kHeight, NULL, recordFlags);
         testStep->draw(testCanvas, reporter);
         testStep->setAssertMessageFormat(kPictureSecondDrawAssertMessageFormat);
         testStep->draw(testCanvas, reporter);