Matrix convolution bounds fix; affectsTransparentBlack fixes.

src/core/SkImageFilter.cpp

Index: src/core/SkImageFilter.cpp
diff --git a/src/core/SkImageFilter.cpp b/src/core/SkImageFilter.cpp
index 6a3286ed67475510be347379142f35d8084cc5df..3f33bc3876a3e9a4a4c9ea753743941be6aa292c 100644
--- a/src/core/SkImageFilter.cpp
+++ b/src/core/SkImageFilter.cpp
@@ -309,9 +309,6 @@ void SkImageFilter::computeFastBounds(const SkRect& src, SkRect* dst) const {
 }
 
 bool SkImageFilter::canComputeFastBounds() const {
-    if (this->affectsTransparentBlack()) {
-        return false;
-    }
     for (int i = 0; i < fInputCount; i++) {
         SkImageFilter* input = this->getInput(i);
         if (input && !input->canComputeFastBounds()) {
@@ -321,10 +318,6 @@ bool SkImageFilter::canComputeFastBounds() const {
     return true;
 }
 
-bool SkImageFilter::affectsTransparentBlack() const {
-    return false;
-}
-
 bool SkImageFilter::onFilterImage(Proxy*, const SkBitmap&, const Context&,
                                   SkBitmap*, SkIPoint*) const {
     return false;
@@ -391,6 +384,14 @@ bool SkImageFilter::filterImageGPU(Proxy* proxy, const SkBitmap& src, const Cont
     return false;
 }
 
+bool SkImageFilter::asAColorFilter(SkColorFilter** filterPtr) const {
+    SkASSERT(nullptr != filterPtr);
+    return this->countInputs() > 0 &&
+           NULL == this->getInput(0) &&
+           this->isColorFilterNode(filterPtr) &&
+           !(*filterPtr)->affectsTransparentBlack();
+}
+
 bool SkImageFilter::applyCropRect(const Context& ctx, const SkBitmap& src,
                                   const SkIPoint& srcOffset, SkIRect* dstBounds,
                                   SkIRect* srcBounds) const {