cc: Make tiling interest rect calc based on viewport.

cc/layers/picture_layer_impl_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 "cc/layers/picture_layer_impl.h"
 
 #include <algorithm>
 #include <limits>
 #include <set>
 #include <utility>
@@ skipping 2537 matching lines @@
 
   gfx::Size layer_bounds(4000, 4000);
   SetupDefaultTrees(layer_bounds);
   EXPECT_TRUE(host_impl_.use_gpu_rasterization());
 
   // Should only have the high-res tiling.
   EXPECT_EQ(1u, active_layer_->tilings()->num_tilings());
 
   active_layer_->HighResTiling()->UpdateAllTilePrioritiesForTesting();
 
-  // High res tiling should have 64 tiles (4x16 tile grid).
-  EXPECT_EQ(64u, active_layer_->HighResTiling()->AllTilesForTesting().size());
+  // High res tiling should have 36 tiles (3X12 tile grid).
+  EXPECT_EQ(36u, active_layer_->HighResTiling()->AllTilesForTesting().size());
 
   // Visible viewport should be covered by 4 tiles.  No other
   // tiles should be required for activation.
   EXPECT_EQ(4u, NumberOfTilesRequired(active_layer_->HighResTiling()));
 }
 
 TEST_F(PictureLayerImplTest, NoTilingIfDoesNotDrawContent) {
   // Set up layers with tilings.
   SetupDefaultTrees(gfx::Size(10, 10));
   SetContentsScaleOnBothLayers(1.f, 1.f, 1.f, 1.f, 0.f, false);
@@ skipping 2455 matching lines @@
   result = layer->CalculateTileSize(gfx::Size(447, 400));
   EXPECT_EQ(result.width(), 448);
   EXPECT_EQ(result.height(), 448);
   result = layer->CalculateTileSize(gfx::Size(500, 499));
   EXPECT_EQ(result.width(), 512);
   EXPECT_EQ(result.height(), 500 + 2);
 }
 
 }  // namespace
 }  // namespace cc