add hard-coded limit for tmp allocations when HQ image scaling

src/core/SkBitmapScaler.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 "SkBitmapScaler.h"
 #include "SkBitmapFilter.h"
 #include "SkConvolver.h"
@@ skipping 227 matching lines @@
     // Convolve into the result.
     SkBitmap result;
     result.setInfo(SkImageInfo::MakeN32(SkScalarCeilToInt(destSubset.width()),
                                       SkScalarCeilToInt(destSubset.height()),
                                       source.alphaType()));
     result.allocPixels(allocator, nullptr);
     if (!result.readyToDraw()) {
       return false;
     }
 
-    BGRAConvolve2D(sourceSubset, static_cast<int>(source.rowBytes()),
-      !source.isOpaque(), filter.xFilter(), filter.yFilter(),
-      static_cast<int>(result.rowBytes()),
-      static_cast<unsigned char*>(result.getPixels()),
-      convolveProcs, true);
+    if (!BGRAConvolve2D(sourceSubset, static_cast<int>(source.rowBytes()),
+                        !source.isOpaque(), filter.xFilter(), filter.yFilter(),
+                        static_cast<int>(result.rowBytes()),
+                        static_cast<unsigned char*>(result.getPixels()),
+                        convolveProcs, true)) {
+        return false;
+    }
 
     *resultPtr = result;
     resultPtr->lockPixels();
     SkASSERT(resultPtr->getPixels());
     return true;
 }