cc: Move SkShader construction to a single spot in PaintShader

cc/paint/paint_op_buffer.h

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CC_PAINT_PAINT_OP_BUFFER_H_
 #define CC_PAINT_PAINT_OP_BUFFER_H_
 
 #include <stdint.h>
 
 #include "base/logging.h"
@@ skipping 95 matching lines @@
 struct CC_PAINT_EXPORT PaintOpWithFlags : PaintOp {
   static constexpr bool kHasPaintFlags = true;
 
   explicit PaintOpWithFlags(const PaintFlags& flags) : flags(flags) {}
 
   int CountSlowPathsFromFlags() const { return flags.getPathEffect() ? 1 : 0; }
   bool HasDiscardableImagesFromFlags() const {
     if (!IsDrawOp())
       return false;
 
-    SkShader* shader = flags.getShader();
+    SkShader* shader = flags.getSkShader();
     SkImage* image = shader ? shader->isAImage(nullptr, nullptr) : nullptr;
     return image && image->isLazyGenerated();
   }
 
   // Subclasses should provide a static RasterWithFlags() method which is called
   // from the Raster() method. The RasterWithFlags() should use the PaintFlags
   // passed to it, instead of the |flags| member directly, as some callers may
   // provide a modified PaintFlags. The RasterWithFlags() method is static with
   // a const PaintOpWithFlags* parameter so that it can be used as a function
   // pointer.
@@ skipping 823 matching lines @@
   size_t subrecord_bytes_used_ = 0;
   bool has_discardable_images_ = false;
   SkRect cull_rect_;
 
   DISALLOW_COPY_AND_ASSIGN(PaintOpBuffer);
 };
 
 }  // namespace cc
 
 #endif  // CC_PAINT_PAINT_OP_BUFFER_H_