Revert of Revert of remove colorfilter native-565 support. complicating w/ no real value.

src/core/SkColorFilter.cpp

Index: src/core/SkColorFilter.cpp
diff --git a/src/core/SkColorFilter.cpp b/src/core/SkColorFilter.cpp
index 0a9cd93e34edb34203801d69465dfc82042028ac..45950ad0b5d35a3496685238c8fb83576d504533 100644
--- a/src/core/SkColorFilter.cpp
+++ b/src/core/SkColorFilter.cpp
@@ -20,15 +20,6 @@
 
 bool SkColorFilter::asComponentTable(SkBitmap*) const {
     return false;
-}
-
-void SkColorFilter::filterSpan16(const uint16_t s[], int count, uint16_t d[]) const {
-    SkASSERT(this->getFlags() & SkColorFilter::kHasFilter16_Flag);
-    SkDEBUGFAIL("missing implementation of SkColorFilter::filterSpan16");
-
-    if (d != s) {
-        memcpy(d, s, count * sizeof(uint16_t));
-    }
 }
 
 SkColor SkColorFilter::filterColor(SkColor c) const {
@@ -59,12 +50,6 @@
     void filterSpan(const SkPMColor shader[], int count, SkPMColor result[]) const SK_OVERRIDE {
         fInner->filterSpan(shader, count, result);
         fOuter->filterSpan(result, count, result);
-    }
-    
-    void filterSpan16(const uint16_t shader[], int count, uint16_t result[]) const SK_OVERRIDE {
-        SkASSERT(this->getFlags() & kHasFilter16_Flag);
-        fInner->filterSpan16(shader, count, result);
-        fOuter->filterSpan16(result, count, result);
     }
     
 #ifndef SK_IGNORE_TO_STRING