Revert of Round GPU tiles to multiple of 64 to work around CA scaling issues

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 f6968c6ba08488fec42fe4ce939bb5ec6f9a0c4e..3e0d73492cce2d446122f55832524d463f0800e7 100644
--- a/cc/layers/picture_layer_impl_unittest.cc
+++ b/cc/layers/picture_layer_impl_unittest.cc
@@ -4770,8 +4770,8 @@
   result = layer->CalculateTileSize(gfx::Size(10000, 10000));
   EXPECT_EQ(result.width(),
             MathUtil::UncheckedRoundUp(
-                2000 + 2 * PictureLayerTiling::kBorderTexels, 64));
-  EXPECT_EQ(result.height(), 512);  // 500 + 2, 64-byte aligned.
+                2000 + 2 * PictureLayerTiling::kBorderTexels, 4));
+  EXPECT_EQ(result.height(), 504);  // 500 + 2, 4-byte aligned.
 
   // Clamp and round-up, when smaller than viewport.
   // Tile-height doubles to 50% when width shrinks to <= 50%.
@@ -4779,7 +4779,7 @@
   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(), 512);  // 500 + 2, 64-byte aliged.
+  EXPECT_EQ(result.height(), 504);  // 500 + 2, 4-byte aliged.
 
   // Largest layer is 50% of viewport width (rounded up), and
   // 50% of viewport in height.
@@ -4788,7 +4788,7 @@
   EXPECT_EQ(result.height(), 448);
   result = layer->CalculateTileSize(gfx::Size(500, 499));
   EXPECT_EQ(result.width(), 512);
-  EXPECT_EQ(result.height(), 512);  // 500 + 2, 64-byte aligned.
+  EXPECT_EQ(result.height(), 504);  // 500 + 2, 4-byte aligned.
 }
 
 TEST_F(NoLowResPictureLayerImplTest, LowResWasHighResCollision) {