stop using SkXfermode -- use SkBlendMode instead

cc/output/gl_renderer.h

 // Copyright 2010 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_OUTPUT_GL_RENDERER_H_
 #define CC_OUTPUT_GL_RENDERER_H_
 
 #include <deque>
 #include <vector>
 
@@ skipping 134 matching lines @@
   void DrawRPDQ(const DrawRenderPassDrawQuadParams& params);
 
   static void ToGLMatrix(float* gl_matrix, const gfx::Transform& transform);
 
   void DiscardPixels();
   void ClearFramebuffer(DrawingFrame* frame);
   void SetViewport();
 
   void DrawDebugBorderQuad(const DrawingFrame* frame,
                            const DebugBorderDrawQuad* quad);
-  static bool IsDefaultBlendMode(SkXfermode::Mode blend_mode) {
-    return blend_mode == SkXfermode::kSrcOver_Mode;
+  static bool IsDefaultBlendMode(SkBlendMode blend_mode) {
+    return blend_mode == SkBlendMode::kSrcOver;
   }
-  bool CanApplyBlendModeUsingBlendFunc(SkXfermode::Mode blend_mode);
-  void ApplyBlendModeUsingBlendFunc(SkXfermode::Mode blend_mode);
-  void RestoreBlendFuncToDefault(SkXfermode::Mode blend_mode);
+  bool CanApplyBlendModeUsingBlendFunc(SkBlendMode blend_mode);
+  void ApplyBlendModeUsingBlendFunc(SkBlendMode blend_mode);
+  void RestoreBlendFuncToDefault(SkBlendMode blend_mode);
 
   gfx::Rect GetBackdropBoundingBoxForRenderPassQuad(
       DrawingFrame* frame,
       const RenderPassDrawQuad* quad,
       const gfx::Transform& contents_device_transform,
       const gfx::QuadF* clip_region,
       bool use_aa,
       gfx::Rect* unclipped_rect);
   std::unique_ptr<ScopedResource> GetBackdropTexture(
       DrawingFrame* frame,
@@ skipping 366 matching lines @@
   bool force_drawing_frame_framebuffer_unflipped_ = false;
 
   BoundGeometry bound_geometry_;
   ColorLUTCache color_lut_cache_;
   DISALLOW_COPY_AND_ASSIGN(GLRenderer);
 };
 
 }  // namespace cc
 
 #endif  // CC_OUTPUT_GL_RENDERER_H_