Update from https://crrev.com/320343

cc/output/software_renderer.h

Index: cc/output/software_renderer.h
diff --git a/cc/output/software_renderer.h b/cc/output/software_renderer.h
index 99868c33fd5f7ab617bcdf9fa8e7b16b9b8f2c49..dc8e2fb0f52399aab8ae6d2a25c794ae9d1dfbb9 100644
--- a/cc/output/software_renderer.h
+++ b/cc/output/software_renderer.h
@@ -52,7 +52,10 @@ class CC_EXPORT SoftwareRenderer : public DirectRenderer {
                      bool draw_rect_covers_full_surface) override;
   void ClearFramebuffer(DrawingFrame* frame,
                         bool has_external_stencil_test) override;
-  void DoDrawQuad(DrawingFrame* frame, const DrawQuad* quad) override;
+
+  void DoDrawQuad(DrawingFrame* frame,
+                  const DrawQuad* quad,
+                  const gfx::QuadF* draw_region) override;
   void BeginDrawingFrame(DrawingFrame* frame) override;
   void FinishDrawingFrame(DrawingFrame* frame) override;
   bool FlippedFramebuffer(const DrawingFrame* frame) const override;