Image filters: implement offsets in GPU path.

src/effects/SkMorphologyImageFilter.cpp

Index: src/effects/SkMorphologyImageFilter.cpp
diff --git a/src/effects/SkMorphologyImageFilter.cpp b/src/effects/SkMorphologyImageFilter.cpp
index cbee8500ac85588eab5f55c835a1f5a84eeb2ba2..cb17c9011b6e9b98b8e7a807580983812e22e9ff 100644
--- a/src/effects/SkMorphologyImageFilter.cpp
+++ b/src/effects/SkMorphologyImageFilter.cpp
@@ -502,9 +502,10 @@ GrTexture* apply_morphology(GrTexture* srcTexture,
 
 };
 
-bool SkDilateImageFilter::filterImageGPU(Proxy* proxy, const SkBitmap& src, SkBitmap* result) {
+bool SkDilateImageFilter::filterImageGPU(Proxy* proxy, const SkBitmap& src, SkBitmap* result,
+                                         SkIPoint* offset) {
     SkBitmap inputBM;
-    if (!SkImageFilterUtils::GetInputResultGPU(getInput(0), proxy, src, &inputBM)) {
+    if (!SkImageFilterUtils::GetInputResultGPU(getInput(0), proxy, src, &inputBM, offset)) {
         return false;
     }
     GrTexture* input = inputBM.getTexture();
@@ -515,9 +516,10 @@ bool SkDilateImageFilter::filterImageGPU(Proxy* proxy, const SkBitmap& src, SkBi
     return SkImageFilterUtils::WrapTexture(resultTex, src.width(), src.height(), result);
 }
 
-bool SkErodeImageFilter::filterImageGPU(Proxy* proxy, const SkBitmap& src, SkBitmap* result) {
+bool SkErodeImageFilter::filterImageGPU(Proxy* proxy, const SkBitmap& src, SkBitmap* result,
+                                        SkIPoint* offset) {
     SkBitmap inputBM;
-    if (!SkImageFilterUtils::GetInputResultGPU(getInput(0), proxy, src, &inputBM)) {
+    if (!SkImageFilterUtils::GetInputResultGPU(getInput(0), proxy, src, &inputBM, offset)) {
         return false;
     }
     GrTexture* input = inputBM.getTexture();