Implement support for a Context parameter in image filters

include/core/SkDevice.h

Index: include/core/SkDevice.h
diff --git a/include/core/SkDevice.h b/include/core/SkDevice.h
index 1773d0ac18abc86119b7c0c607e4c82c01b736d2..f0c80985d3f1fea87f2fa2f568824734e4fcff57 100644
--- a/include/core/SkDevice.h
+++ b/include/core/SkDevice.h
@@ -15,6 +15,7 @@
 #include "SkCanvas.h"
 #include "SkColor.h"
 #include "SkDeviceProperties.h"
+#include "SkImageFilter.h"
 
 // getDeviceCapabilities() is not called by skia, but this flag keeps it around
 // for clients that have "override" annotations on their subclass. These overrides
@@ -372,7 +373,8 @@ protected:
      *  If the device does not recognize or support this filter,
      *  it just returns false and leaves result and offset unchanged.
      */
-    virtual bool filterImage(const SkImageFilter*, const SkBitmap&, const SkMatrix&,
+    virtual bool filterImage(const SkImageFilter*, const SkBitmap&,
+                             const SkImageFilter::Context& ctx,
                              SkBitmap* result, SkIPoint* offset) = 0;
 
     // This is equal kBGRA_Premul_Config8888 or kRGBA_Premul_Config8888 if