Change GPU Tile rounding to 32

cc/layers/picture_layer_impl_unittest.cc

Index: cc/layers/picture_layer_impl_unittest.cc
diff --git a/cc/layers/picture_layer_impl_unittest.cc b/cc/layers/picture_layer_impl_unittest.cc
index 1272add7f9e90be56810e6d190d15e5c133ffd5b..59b6f58391c805d65e244d9f9a3568baec20e48f 100644
--- a/cc/layers/picture_layer_impl_unittest.cc
+++ b/cc/layers/picture_layer_impl_unittest.cc
@@ -4754,8 +4754,8 @@ TEST_F(TileSizeTest, TileSizes) {
   result = layer->CalculateTileSize(gfx::Size(10000, 10000));
   EXPECT_EQ(result.width(),
             MathUtil::UncheckedRoundUp(
-                2000 + 2 * PictureLayerTiling::kBorderTexels, 4));
-  EXPECT_EQ(result.height(), 504);  // 500 + 2, 4-byte aligned.
+                2000 + 2 * PictureLayerTiling::kBorderTexels, 32));
+  EXPECT_EQ(result.height(), 512);  // 500 + 2, 32-byte aligned.
 
   // Clamp and round-up, when smaller than viewport.
   // Tile-height doubles to 50% when width shrinks to <= 50%.
@@ -4763,7 +4763,7 @@ TEST_F(TileSizeTest, TileSizes) {
   layer->set_gpu_raster_max_texture_size(host_impl()->device_viewport_size());
   result = layer->CalculateTileSize(gfx::Size(447, 10000));
   EXPECT_EQ(result.width(), 448);
-  EXPECT_EQ(result.height(), 504);  // 500 + 2, 4-byte aliged.
+  EXPECT_EQ(result.height(), 512);  // 500 + 2, 32-byte aliged.
 
   // Largest layer is 50% of viewport width (rounded up), and
   // 50% of viewport in height.
@@ -4772,7 +4772,7 @@ TEST_F(TileSizeTest, TileSizes) {
   EXPECT_EQ(result.height(), 448);
   result = layer->CalculateTileSize(gfx::Size(500, 499));
   EXPECT_EQ(result.width(), 512);
-  EXPECT_EQ(result.height(), 504);  // 500 + 2, 4-byte aligned.
+  EXPECT_EQ(result.height(), 512);  // 500 + 2, 32-byte aligned.
 }
 
 TEST_F(NoLowResPictureLayerImplTest, LowResWasHighResCollision) {