Add createNewCompatibleDevice. Allow devices to have a NULL factory and saveLayer will fall back on createNewCompatibleDevice.

Review URL: http://codereview.appspot.com/4633044/



git-svn-id: http://skia.googlecode.com/svn/trunk@1625 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/samplecode/SampleTextureDomain.cpp b/samplecode/SampleTextureDomain.cpp
index 37f584e..1810723 100755
--- a/samplecode/SampleTextureDomain.cpp
+++ b/samplecode/SampleTextureDomain.cpp
@@ -54,7 +54,7 @@
         // Note:  GPU-backed bitmaps follow a different rendering path
         // when copying from one GPU device to another.
         SkRefPtr<SkDevice> primaryDevice(canvas->getDevice());
-        SkRefPtr<SkDevice> secondDevice(canvas->createDevice(
+        SkRefPtr<SkDevice> secondDevice(canvas->createCompatibleDevice(
                 SkBitmap::kARGB_8888_Config, 5, 5, true));
         secondDevice->unref();
         SkCanvas secondCanvas(secondDevice.get());