onCreateDevice -> NULL now means the caller should create its own (bitmap) device

src/core/SkDeviceImageFilterProxy.h

Index: src/core/SkDeviceImageFilterProxy.h
diff --git a/src/core/SkDeviceImageFilterProxy.h b/src/core/SkDeviceImageFilterProxy.h
index dcf12f7c4016d1564f92a9cd707c6ca68b3cabbe..79ff957564c48af5661dff3e3e5d0296499e2070 100644
--- a/src/core/SkDeviceImageFilterProxy.h
+++ b/src/core/SkDeviceImageFilterProxy.h
@@ -8,6 +8,7 @@
 #ifndef SkDeviceImageFilterProxy_DEFINED
 #define SkDeviceImageFilterProxy_DEFINED
 
+#include "SkBitmapDevice.h"
 #include "SkDevice.h"
 #include "SkImageFilter.h"
 #include "SkSurfaceProps.h"
@@ -24,7 +25,11 @@ public:
                                        SkBaseDevice::kNever_TileUsage,
                                        kUnknown_SkPixelGeometry,
                                        true /*forImageFilter*/);
-        return fDevice->onCreateDevice(cinfo, NULL);
+        SkBaseDevice* dev = fDevice->onCreateDevice(cinfo, NULL);
+        if (NULL == dev) {
+            dev = SkBitmapDevice::Create(cinfo.fInfo);
+        }
+        return dev;
     }
     bool canHandleImageFilter(const SkImageFilter* filter) override {
         return fDevice->canHandleImageFilter(filter);