Add SkDivMod with a special case for ARM.

src/core/SkScaledImageCache.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkScaledImageCache.h"
 #include "SkMipMap.h"
 #include "SkPixelRef.h"
@@ skipping 30 matching lines @@
     return hash;
 }
 
 struct Key {
     bool init(const SkBitmap& bm, SkScalar scaleX, SkScalar scaleY) {
         SkPixelRef* pr = bm.pixelRef();
         if (!pr) {
             return false;
         }
 
-        size_t offset = bm.pixelRefOffset();
-        size_t rowBytes = bm.rowBytes();
-        int x = (offset % rowBytes) >> 2;
-        int y = offset / rowBytes;
+        size_t x, y;
+        SkTDivMod(bm.pixelRefOffset(), bm.rowBytes(), &y, &x);
+        x >>= 2;
 
         fGenID = pr->getGenerationID();
         fBounds.set(x, y, x + bm.width(), y + bm.height());
         fScaleX = scaleX;
         fScaleY = scaleY;
 
         fHash = compute_hash(&fGenID, 7);
         return true;
     }
 
@@ skipping 451 matching lines @@
     return SkScaledImageCache::GetBytesUsed();
 }
 
 size_t SkGraphics::GetImageCacheByteLimit() {
     return SkScaledImageCache::GetByteLimit();
 }
 
 size_t SkGraphics::SetImageCacheByteLimit(size_t newLimit) {
     return SkScaledImageCache::SetByteLimit(newLimit);
 }