Change some more GMs to clear to opaque black, not transparent black.

gm/tileimagefilter.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "sk_tool_utils.h"
 #include "SkBitmapSource.h"
 #include "SkColorFilterImageFilter.h"
@@ skipping 38 matching lines @@
     virtual void onDraw(SkCanvas* canvas) {
         if (!fInitialized) {
             make_bitmap();
 
             fCheckerboard.allocN32Pixels(80, 80);
             SkCanvas checkerboardCanvas(fCheckerboard);
             sk_tool_utils::draw_checkerboard(&checkerboardCanvas, 0xFFA0A0A0, 0xFF404040, 8);
 
             fInitialized = true;
         }
-        canvas->clear(0x00000000);
+        canvas->clear(SK_ColorBLACK);
 
         int x = 0, y = 0;
         for (size_t i = 0; i < 4; i++) {
             SkBitmap* bitmap = (i & 0x01) ? &fCheckerboard : &fBitmap;
             SkRect srcRect = SkRect::MakeXYWH(SkIntToScalar(bitmap->width()/4),
                                               SkIntToScalar(bitmap->height()/4),
                                               SkIntToScalar(bitmap->width()/(i+1)),
                                               SkIntToScalar(bitmap->height()/(i+1)));
             SkRect dstRect = SkRect::MakeXYWH(SkIntToScalar(i * 8),
                                               SkIntToScalar(i * 4),
@@ skipping 43 matching lines @@
     SkBitmap fBitmap, fCheckerboard;
     bool fInitialized;
 };
 
 //////////////////////////////////////////////////////////////////////////////
 
 static GM* MyFactory(void*) { return new TileImageFilterGM; }
 static GMRegistry reg(MyFactory);
 
 }