Initialize memory for BitMask and Clip test.

tests/BlitMaskClip.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 "SkBlitter.h"
 #include "SkMask.h"
 #include "Test.h"
+#include <string.h>
 
 class TestBlitter : public SkBlitter {
 public:
     TestBlitter(SkIRect bounds, skiatest::Reporter* reporter)
         : fBounds(bounds)
         , fReporter(reporter) { }
 
     void blitH(int x, int y, int width) override {
 
         REPORTER_ASSERT(fReporter, x >= fBounds.fLeft && x < fBounds.fRight);
         REPORTER_ASSERT(fReporter, y >= fBounds.fTop && y < fBounds.fBottom);
         int right = x + width;
         REPORTER_ASSERT(fReporter, right > fBounds.fLeft && right <= fBounds.fRight);
     }
 
 private:
     SkIRect fBounds;
     skiatest::Reporter* fReporter;
 };
 
-
 // Exercise all clips compared with different widths of bitMask. Make sure that no buffer
 // overruns happen.
 DEF_TEST(BlitAndClip, reporter) {
     const int originX = 100;
     const int originY = 100;
     for (int width = 1; width <= 32; width++) {
         const int height = 2;
         int rowBytes = (width + 7) >> 3;
         uint8_t* bits = new uint8_t[rowBytes * height];
+        memset(bits, 0xAA, rowBytes * height);
 
         SkIRect b = {originX, originY, originX + width, originY + height};
 
         SkMask mask;
         mask.fFormat = SkMask::kBW_Format;
         mask.fBounds = b;
         mask.fImage = (uint8_t*)bits;
         mask.fRowBytes = rowBytes;
 
         TestBlitter tb(mask.fBounds, reporter);
 
         for (int top = b.fTop; top < b.fBottom; top++) {
             for (int bottom = top + 1; bottom <= b.fBottom; bottom++) {
                 for (int left = b.fLeft; left < b.fRight; left++) {
                     for (int right = left + 1; right <= b.fRight; right++) {
                         SkIRect clipRect = {left, top, right, bottom};
                         tb.blitMask(mask, clipRect);
                     }
                 }
             }
         }
 
         delete [] bits;
     }
 }