Change signatures of filter bounds methods to return a rect.

src/effects/SkImageSource.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkImageSource.h"
 
 #include "SkCanvas.h"
@@ skipping 95 matching lines @@
         fSrcRect.width() == dstRect.width() && fSrcRect.height() == dstRect.height() ?
                kNone_SkFilterQuality : fFilterQuality);
     canvas->drawImageRect(fImage.get(), fSrcRect, dstRect, &paint,
                           SkCanvas::kStrict_SrcRectConstraint);
 
     offset->fX = dstIRect.fLeft;
     offset->fY = dstIRect.fTop;
     return surf->makeImageSnapshot().release();
 }
 
-void SkImageSource::computeFastBounds(const SkRect& src, SkRect* dst) const {
-    *dst = fDstRect;
+SkRect SkImageSource::computeFastBounds(const SkRect& src) const {
+    return fDstRect;
 }
 
 #ifndef SK_IGNORE_TO_STRING
 void SkImageSource::toString(SkString* str) const {
     str->appendf("SkImageSource: (");
     str->appendf("src: (%f,%f,%f,%f) dst: (%f,%f,%f,%f) ",
                  fSrcRect.fLeft, fSrcRect.fTop, fSrcRect.fRight, fSrcRect.fBottom,
                  fDstRect.fLeft, fDstRect.fTop, fDstRect.fRight, fDstRect.fBottom);
     str->appendf("image: (%d,%d)",
                  fImage->width(), fImage->height());
     str->append(")");
 }
 #endif