Change clear() to respect the clip

src/utils/SkGatherPixelRefsAndRects.h

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkGatherPixelRefsAndRects_DEFINED
 #define SkGatherPixelRefsAndRects_DEFINED
 
@@ skipping 22 matching lines @@
 
     virtual ~SkGatherPixelRefsAndRectsDevice() {
         SkSafeUnref(fPRCont);
     }
 
     virtual SkImageInfo imageInfo() const SK_OVERRIDE {
         return fEmptyBitmap.info();
     }
 
 protected:
-    virtual void clear(SkColor color) SK_OVERRIDE {
-        NothingToDo();
-    }
     virtual void drawPaint(const SkDraw& draw, const SkPaint& paint) SK_OVERRIDE {
         SkBitmap bm;
 
         if (GetBitmapFromPaint(paint, &bm)) {
             SkRect clipRect = SkRect::Make(draw.fRC->getBounds());
             fPRCont->add(bm.pixelRef(), clipRect);
         }
     }
     virtual void drawPoints(const SkDraw& draw, SkCanvas::PointMode mode, size_t count,
                             const SkPoint points[], const SkPaint& paint) SK_OVERRIDE {
@@ skipping 256 matching lines @@
     static void NotSupported() {
         SkDEBUGFAIL("this method should never be called");
     }
 
     static void NothingToDo() {}
 
     typedef SkBaseDevice INHERITED;
 };
 
 #endif // SkGatherPixelRefsAndRects_DEFINED