Implement support for a Context parameter in image filters

src/effects/SkColorFilterImageFilter.cpp

Index: src/effects/SkColorFilterImageFilter.cpp
diff --git a/src/effects/SkColorFilterImageFilter.cpp b/src/effects/SkColorFilterImageFilter.cpp
index c8256919dc34d93ee68963ebc0c3b73cfe30ad4e..0de73301b13cb702d15e88978bd6f934f76e4b8c 100755
--- a/src/effects/SkColorFilterImageFilter.cpp
+++ b/src/effects/SkColorFilterImageFilter.cpp
@@ -99,19 +99,19 @@ SkColorFilterImageFilter::~SkColorFilterImageFilter() {
 }
 
 bool SkColorFilterImageFilter::onFilterImage(Proxy* proxy, const SkBitmap& source,
-                                             const SkMatrix& matrix,
+                                             const Context& ctx,
                                              SkBitmap* result,
                                              SkIPoint* offset) const {
     SkBitmap src = source;
     SkIPoint srcOffset = SkIPoint::Make(0, 0);
-    if (getInput(0) && !getInput(0)->filterImage(proxy, source, matrix, &src, &srcOffset)) {
+    if (getInput(0) && !getInput(0)->filterImage(proxy, source, ctx, &src, &srcOffset)) {
         return false;
     }
 
     SkIRect bounds;
     src.getBounds(&bounds);
     bounds.offset(srcOffset);
-    if (!this->applyCropRect(&bounds, matrix)) {
+    if (!this->applyCropRect(&bounds, ctx.ctm())) {
         return false;
     }