Use child processors to implement compose color filter.

src/gpu/SkGr.cpp

 /*
  * Copyright 2010 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkGr.h"
 
 #include "GrCaps.h"
@@ skipping 794 matching lines @@
             grPaint->setColor(SkColorToPremulGrColor(skPaint.getColor()));
             applyColorFilterToPaintColor = true;
         }
     }
 
     SkColorFilter* colorFilter = skPaint.getColorFilter();
     if (colorFilter) {
         if (applyColorFilterToPaintColor) {
             grPaint->setColor(SkColorToPremulGrColor(colorFilter->filterColor(skPaint.getColor())));
         } else {
-            SkTDArray<const GrFragmentProcessor*> array;
-            if (colorFilter->asFragmentProcessors(context, grPaint->getProcessorDataManager(),
-                                                  &array)) {
-                for (int i = 0; i < array.count(); ++i) {
-                    grPaint->addColorFragmentProcessor(array[i])->unref();
-                }
+            SkAutoTUnref<const GrFragmentProcessor> cfFP(
+                colorFilter->asFragmentProcessor(context, grPaint->getProcessorDataManager()));
+            if (cfFP) {
+                grPaint->addColorFragmentProcessor(cfFP);
             } else {
                 return false;
             }
         }
     }
 
     SkXfermode* mode = skPaint.getXfermode();
     GrXPFactory* xpFactory = nullptr;
     if (!SkXfermode::AsXPFactory(mode, &xpFactory)) {
         // Fall back to src-over
@@ skipping 110 matching lines @@
             SkErrorInternals::SetError( kInvalidPaint_SkError,
                                         "Sorry, I don't understand the filtering "
                                         "mode you asked for.  Falling back to "
                                         "MIPMaps.");
             textureFilterMode = GrTextureParams::kMipMap_FilterMode;
             break;
 
     }
     return textureFilterMode;
 }