remove supports4f flag for colorfilters

tests/SkColor4fTest.cpp

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkColor.h"
 #include "SkColorMatrixFilter.h"
 #include "SkGradientShader.h"
@@ skipping 170 matching lines @@
     SkRandom rand;
     for (int i = 0; i < N; ++i) {
         src4b[i] = SkPreMultiplyColor(rand.nextU());
         src4f[i] = SkPM4f::FromPMColor(src4b[i]);
     }
     // confirm that our srcs are (nearly) equal
     compare_spans(src4f, src4b, N, reporter);
 
     for (const auto& rec : recs) {
         SkAutoTUnref<SkColorFilter> filter(rec.fFact());
-        REPORTER_ASSERT(reporter, filter->supports4f() == rec.fSupports4f);
-        if (filter->supports4f()) {
-            SkPMColor dst4b[N];
-            filter->filterSpan(src4b, N, dst4b);
-            SkPM4f dst4f[N];
-            filter->filterSpan4f(src4f, N, dst4f);
-            compare_spans(dst4f, dst4b, N, reporter);
-        }
+        SkPMColor dst4b[N];
+        filter->filterSpan(src4b, N, dst4b);
+        SkPM4f dst4f[N];
+        filter->filterSpan4f(src4f, N, dst4f);
+        compare_spans(dst4f, dst4b, N, reporter);
     }
 }
 
 ///////////////////////////////////////////////////////////////////////////////////////////////////
 
 typedef SkPM4f (*SkXfermodeProc4f)(const SkPM4f& src, const SkPM4f& dst);
 
 static bool compare_procs(SkXfermodeProc proc32, SkXfermodeProc4f proc4f) {
     const float kTolerance = 1.0f / 255;
 
@@ skipping 24 matching lines @@
 //
 DEF_TEST(Color4f_xfermode_proc4f, reporter) {
     // TODO: extend xfermodes so that all cases can be tested.
     //
     for (int mode = SkXfermode::kClear_Mode; mode <= SkXfermode::kScreen_Mode; ++mode) {
         SkXfermodeProc   proc32 = SkXfermode::GetProc((SkXfermode::Mode)mode);
         SkXfermodeProc4f proc4f = SkXfermode::GetProc4f((SkXfermode::Mode)mode);
         REPORTER_ASSERT(reporter, compare_procs(proc32, proc4f));
     }
 }