cc: Move SkShader construction to a single spot in PaintShader

third_party/WebKit/Source/modules/canvas2d/BaseRenderingContext2D.cpp

 // Copyright 2016 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.
 
 #include "modules/canvas2d/BaseRenderingContext2D.h"
 
 #include "bindings/core/v8/ExceptionMessages.h"
 #include "bindings/core/v8/ExceptionState.h"
 #include "core/css/cssom/CSSURLImageValue.h"
 #include "core/css/parser/CSSParser.h"
@@ skipping 1813 matching lines @@
     is_source_over = mode == SkBlendMode::kSrcOver;
     if (!is_source_over && mode != SkBlendMode::kSrc &&
         mode != SkBlendMode::kClear)
       return;  // The code below only knows how to handle Src, SrcOver, and
                // Clear
 
     alpha = flags->getAlpha();
 
     if (is_source_over &&
         image_type == CanvasRenderingContext2DState::kNoImage) {
-      PaintShader* shader = flags->getShader();
-      if (shader) {
-        if (shader->isOpaque() && alpha == 0xFF)
+      if (flags->HasShader()) {
+        if (flags->ShaderIsOpaque() && alpha == 0xFF)
           GetImageBuffer()->WillOverwriteCanvas();
         return;
       }
     }
   }
 
   if (is_source_over) {
     // With source over, we need to certify that alpha == 0xFF for all pixels
     if (image_type == CanvasRenderingContext2DState::kNonOpaqueImage)
       return;
@@ skipping 31 matching lines @@
       num_filters(0),
       num_get_image_data_calls(0),
       area_get_image_data_calls(0.0),
       num_put_image_data_calls(0),
       area_put_image_data_calls(0.0),
       num_clear_rect_calls(0),
       num_draw_focus_calls(0),
       num_frames_since_reset(0) {}
 
 }  // namespace blink