Optionally clear PlatformCanvas instances.

ui/gfx/blit_unittest.cc

 // Copyright (c) 2010 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 "base/basictypes.h"
 #include "base/shared_memory.h"
 #include "skia/ext/platform_canvas.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/gfx/blit.h"
 #include "ui/gfx/point.h"
@@ skipping 43 matching lines @@
       ASSERT_EQ(expected, *bitmap.getAddr32(x, y));
     }
   }
 }
 
 }  // namespace
 
 TEST(Blit, ScrollCanvas) {
   static const int kCanvasWidth = 5;
   static const int kCanvasHeight = 5;
-  skia::PlatformCanvas canvas(kCanvasWidth, kCanvasHeight, true);
+  skia::PlatformCanvas canvas(kCanvasWidth, kCanvasHeight,
+                              skia::PlatformDevice::FLAGS_OPAQUE);
   uint8 initial_values[kCanvasHeight][kCanvasWidth] = {
       { 0x00, 0x01, 0x02, 0x03, 0x04 },
       { 0x10, 0x11, 0x12, 0x13, 0x14 },
       { 0x20, 0x21, 0x22, 0x23, 0x24 },
       { 0x30, 0x31, 0x32, 0x33, 0x34 },
       { 0x40, 0x41, 0x42, 0x43, 0x44 }};
   SetToCanvas<5, 5>(&canvas, initial_values);
 
   // Sanity check on input.
   VerifyCanvasValues<5, 5>(&canvas, initial_values);
@@ skipping 78 matching lines @@
       { 0x20, 0x21, 0x22, 0x23, 0x24 },
       { 0x30, 0x31, 0x32, 0x33, 0x34 },
       { 0x40, 0x41, 0x42, 0x43, 0x44 }};
   SetToCanvas<5, 5>(&canvas, initial_values);
 
   // Sanity check on input.
   VerifyCanvasValues<5, 5>(&canvas, initial_values);
 }
 
 #endif
-