Move GrDrawTarget::clear logic into GrDrawContext

src/gpu/GrDrawTarget.h

Index: src/gpu/GrDrawTarget.h
diff --git a/src/gpu/GrDrawTarget.h b/src/gpu/GrDrawTarget.h
index 7b268c28270697b5a097a9d5f23379bc2ff4db49..5f91baa33b6e4ffe8711d4a56881c5a254946fa4 100644
--- a/src/gpu/GrDrawTarget.h
+++ b/src/gpu/GrDrawTarget.h
@@ -106,6 +106,8 @@ public:
 
     void drawBatch(const GrPipelineBuilder&, GrDrawContext*, const GrClip&, GrDrawBatch*);
 
+    void addBatch(sk_sp<GrBatch>);
+
     /**
      * Draws path into the stencil buffer. The fill must be either even/odd or
      * winding (not inverse or hairline). It will respect the HW antialias flag
@@ -116,16 +118,6 @@ public:
                      const GrClip&, const SkMatrix& viewMatrix,
                      const GrPath*, GrPathRendering::FillType);
 
-    /**
-     * Clear the passed in drawContext. Ignores the GrPipelineBuilder and clip. Clears the whole
-     * thing if rect is nullptr, otherwise just the rect. If canIgnoreRect is set then the entire
-     * drawContext can be optionally cleared.
-     */
-    void clear(const SkIRect* rect,
-               GrColor color,
-               bool canIgnoreRect,
-               GrDrawContext*);
-
     /** Discards the contents render target. */
     void discard(GrRenderTarget*);