Fix Valgrind UMR errors by initializing thumbnail pixels....

chrome/browser/history/top_sites_unittest.cc

 // Copyright (c) 2009 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/history/top_sites.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 
 namespace history {
 
@@ skipping 142 matching lines @@
   mv.redirects.push_back(url1b);
   list.push_back(mv);
 
   // Save our most visited data containing that one site.
   StoreMostVisited(&list);
 
   // Create a dummy thumbnail.
   SkBitmap thumbnail;
   thumbnail.setConfig(SkBitmap::kARGB_8888_Config, 4, 4);
   thumbnail.allocPixels();
+  thumbnail.eraseRGB(0x00, 0x00, 0x00);
 
   base::Time now = base::Time::Now();
   ThumbnailScore low_score(1.0, true, true, now);
   ThumbnailScore medium_score(0.5, true, true, now);
   ThumbnailScore high_score(0.0, true, true, now);
 
   // Setting the thumbnail for nonexistant pages should fail.
   EXPECT_FALSE(top_sites().SetPageThumbnail(nonexistant_url,
                                             thumbnail, medium_score));
 
   // Setting the thumbnail for url2 should succeed, lower scores shouldn't
   // replace it, higher scores should.
   EXPECT_TRUE(top_sites().SetPageThumbnail(url2, thumbnail, medium_score));
   EXPECT_FALSE(top_sites().SetPageThumbnail(url2, thumbnail, low_score));
   EXPECT_TRUE(top_sites().SetPageThumbnail(url2, thumbnail, high_score));
 
   // Set on the redirect source should succeed. It should be replacable by
   // the same score on the redirect destination, which in turn should not
   // be replaced by the source again.
   EXPECT_TRUE(top_sites().SetPageThumbnail(url1a, thumbnail, medium_score));
   EXPECT_TRUE(top_sites().SetPageThumbnail(url1b, thumbnail, medium_score));
   EXPECT_FALSE(top_sites().SetPageThumbnail(url1a, thumbnail, medium_score));
 }
 
 }  // namespace history