Revert of Moved ambient lights out of SkLight's light array

src/utils/SkShadowPaintFilterCanvas.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 "SkPathEffect.h"
 #include "SkShadowPaintFilterCanvas.h"
 
@@ skipping 32 matching lines @@
         newPaint.setColor(color);
 
         *paint->writable() = newPaint;
     }
 
     return true;
 }
 
 SkISize SkShadowPaintFilterCanvas::ComputeDepthMapSize(const SkLights::Light& light, int maxDepth,
                                                        int width, int height) {
+    SkASSERT(light.type() != SkLights::Light::kAmbient_LightType);
     if (light.type() != SkLights::Light::kDirectional_LightType) {
         return SkISize::Make(width *2 , height * 2);
     }
 
     int dMapWidth = SkMin32(maxDepth * fabs(light.dir().fX) + width,
                             width * 2);
     int dMapHeight = SkMin32(maxDepth * fabs(light.dir().fY) + height,
                              height * 2);
     return SkISize::Make(dMapWidth, dMapHeight);
 }
@@ skipping 179 matching lines @@
 }
 
 void SkShadowPaintFilterCanvas::onDrawTextBlob(const SkTextBlob *blob, SkScalar x, SkScalar y,
                                                const SkPaint &paint) {
     this->updateMatrix();
     this->INHERITED::onDrawTextBlob(blob, x, y, paint);
     this->restore();
 }
 
 #endif