Fix an uninit in CursorLoaderX11Test.ScaleAndRotate test.

ui/base/cursor/cursor_loader_x11_unittest.cc

 // Copyright 2013 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 "ui/base/cursor/cursor_loader_x11.h"
 
 #undef None
 #undef Bool
 
 #include "base/logging.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "ui/base/cursor/cursor_util.h"
 
 namespace ui {
 
 TEST(CursorLoaderX11Test, ScaleAndRotate) {
   SkBitmap bitmap;
   bitmap.setConfig(SkBitmap::kARGB_8888_Config, 10, 5);
   bitmap.allocPixels();
+  bitmap.eraseColor(SK_ColorBLACK);
 
   gfx::Point hotpoint(3,4);
 
   ScaleAndRotateCursorBitmapAndHotpoint(1.0f,
                                         gfx::Display::ROTATE_0,
                                         &bitmap,
                                         &hotpoint);
   EXPECT_EQ(10, bitmap.width());
   EXPECT_EQ(5, bitmap.height());
   EXPECT_EQ("3,4", hotpoint.ToString());
@@ skipping 18 matching lines @@
   ScaleAndRotateCursorBitmapAndHotpoint(1.0f,
                                         gfx::Display::ROTATE_270,
                                         &bitmap,
                                         &hotpoint);
   EXPECT_EQ(20, bitmap.width());
   EXPECT_EQ(10, bitmap.height());
   EXPECT_EQ("14,2", hotpoint.ToString());
 }
 
 }  // namespace ui