Makes tile-creation lazy

cc/resources/picture_layer_tiling_set_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_set.h"
 
 #include <vector>
 
 #include "cc/resources/resource_pool.h"
 #include "cc/resources/resource_provider.h"
 #include "cc/test/fake_output_surface.h"
 #include "cc/test/fake_picture_layer_tiling_client.h"
 #include "cc/test/fake_tile_manager_client.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/gfx/size_conversions.h"
 
 namespace cc {
 namespace {
 
 TEST(PictureLayerTilingSetTest, NoResources) {
   FakePictureLayerTilingClient client;
-  PictureLayerTilingSet set(&client);
+  gfx::Size layer_bounds(1000, 800);
+  PictureLayerTilingSet set(&client, layer_bounds);
   client.SetTileSize(gfx::Size(256, 256));
 
-  gfx::Size layer_bounds(1000, 800);
-  set.SetLayerBounds(layer_bounds);
-
   set.AddTiling(1.0);
   set.AddTiling(1.5);
   set.AddTiling(2.0);
 
   float contents_scale = 2.0;
   gfx::Size content_bounds(
       gfx::ToCeiledSize(gfx::ScaleSize(layer_bounds, contents_scale)));
   gfx::Rect content_rect(content_bounds);
 
   Region remaining(content_rect);
@@ skipping 22 matching lines @@
       float scale_increment,
       float ideal_contents_scale,
       float expected_scale) {
     scoped_ptr<FakeOutputSurface> output_surface =
         FakeOutputSurface::Create3d();
     scoped_ptr<ResourceProvider> resource_provider =
         ResourceProvider::Create(output_surface.get(), 0);
 
     FakePictureLayerTilingClient client;
     client.SetTileSize(gfx::Size(256, 256));
-    PictureLayerTilingSet set(&client);
-
     gfx::Size layer_bounds(1000, 800);
-    set.SetLayerBounds(layer_bounds);
+    PictureLayerTilingSet set(&client, layer_bounds);
 
     float scale = min_scale;
     for (int i = 0; i < num_tilings; ++i, scale += scale_increment) {
       PictureLayerTiling* tiling = set.AddTiling(scale);
+      tiling->CreateAllTilesForTesting();
       std::vector<Tile*> tiles = tiling->AllTilesForTesting();
       for (size_t i = 0; i < tiles.size(); ++i) {
         EXPECT_FALSE(tiles[i]->drawing_info().GetResourceForTesting());
 
         tiles[i]->drawing_info().GetResourceForTesting() =
             make_scoped_ptr(new ResourcePool::Resource(
                 resource_provider.get(),
                 gfx::Size(1, 1),
                 resource_provider->best_texture_format()));
       }
@@ skipping 56 matching lines @@
 TEST_F(PictureLayerTilingSetTestWithResources, ManyTilings_Equal) {
   runTest(10, 1.f, 1.f, 5.f, 5.f);
 }
 
 TEST_F(PictureLayerTilingSetTestWithResources, ManyTilings_NotEqual) {
   runTest(10, 1.f, 1.f, 4.5f, 5.f);
 }
 
 }  // namespace
 }  // namespace cc