Add crop rect support for SkDisplacementMapEffect (raster and GPU paths).
Covered by new test cases added to displacement GM (will require rebaseline).

R=bsalomon@google.com

Review URL: https://codereview.chromium.org/26531002

git-svn-id: http://skia.googlecode.com/svn/trunk/include@11782 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/effects/SkDisplacementMapEffect.h b/effects/SkDisplacementMapEffect.h
index ed9d15b..d789ca2 100644
--- a/effects/SkDisplacementMapEffect.h
+++ b/effects/SkDisplacementMapEffect.h
@@ -25,7 +25,8 @@
     SkDisplacementMapEffect(ChannelSelectorType xChannelSelector,
                             ChannelSelectorType yChannelSelector,
                             SkScalar scale, SkImageFilter* displacement,
-                            SkImageFilter* color = NULL);
+                            SkImageFilter* color = NULL,
+                            const CropRect* cropRect = NULL);
 
     ~SkDisplacementMapEffect();