Revert of 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 3f33bc3876a3e9a4a4c9ea753743941be6aa292c..6a3286ed67475510be347379142f35d8084cc5df 100644
--- a/src/core/SkImageFilter.cpp
+++ b/src/core/SkImageFilter.cpp
@@ -309,6 +309,9 @@
 }
 
 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()) {
@@ -316,6 +319,10 @@
         }
     }
     return true;
+}
+
+bool SkImageFilter::affectsTransparentBlack() const {
+    return false;
 }
 
 bool SkImageFilter::onFilterImage(Proxy*, const SkBitmap&, const Context&,
@@ -382,14 +389,6 @@
     }
 #endif
     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,