Makes tile-creation lazy

cc/resources/picture_layer_tiling_unittest.cc

 // Copyright 2012 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 "cc/resources/picture_layer_tiling.h"
 
 #include "cc/test/fake_picture_layer_tiling_client.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/gfx/rect_conversions.h"
 #include "ui/gfx/size_conversions.h"
 
 namespace cc {
 namespace {
 
 class PictureLayerTilingIteratorTest : public testing::Test {
  public:
   PictureLayerTilingIteratorTest() {}
   virtual ~PictureLayerTilingIteratorTest() {}
 
   void Initialize(gfx::Size tile_size,
                   float contents_scale,
                   gfx::Size layer_bounds) {
     client_.SetTileSize(tile_size);
-    tiling_ = PictureLayerTiling::Create(contents_scale);
-    tiling_->SetClient(&client_);
-    tiling_->SetLayerBounds(layer_bounds);
+    tiling_ = PictureLayerTiling::Create(contents_scale,
+                                         layer_bounds,
+                                         &client_);
   }
 
   void VerifyTilesExactlyCoverRect(
       float rect_scale,
       gfx::Rect request_rect,
       gfx::Rect expect_rect) {
     EXPECT_TRUE(request_rect.Contains(expect_rect));
 
     // Iterators are not valid if this ratio is too large (i.e. the
     // tiling is too high-res for a low-res destination rect.)  This is an
@@ skipping 317 matching lines @@
   gfx::Rect in(40, 50, 100, 200);
   gfx::Rect bounds(0, 0, 10, 10);
   int64 target_area = 400 * 400;
   gfx::Rect out = PictureLayerTiling::ExpandRectEquallyToAreaBoundedBy(
       in, target_area, bounds);
   EXPECT_TRUE(out.IsEmpty());
 }
 
 }  // namespace
 }  // namespace cc