cc: Change preraster/predecode split to be half of max skewport extent.

cc/tiles/picture_layer_tiling_set_unittest.cc

Index: cc/tiles/picture_layer_tiling_set_unittest.cc
diff --git a/cc/tiles/picture_layer_tiling_set_unittest.cc b/cc/tiles/picture_layer_tiling_set_unittest.cc
index 97e0a4260bb108daae440df029bcba0a35e0bb9d..503f233764c693e1952d8c466292cdb943dfa050 100644
--- a/cc/tiles/picture_layer_tiling_set_unittest.cc
+++ b/cc/tiles/picture_layer_tiling_set_unittest.cc
@@ -28,12 +28,14 @@ class TestablePictureLayerTilingSet : public PictureLayerTilingSet {
       PictureLayerTilingClient* client,
       int tiling_interest_area_padding,
       float skewport_target_time_in_seconds,
-      int skewport_extrapolation_limit_in_screen_pixels)
+      int skewport_extrapolation_limit_in_screen_pixels,
+      float max_preraster_distance)
       : PictureLayerTilingSet(tree,
                               client,
                               tiling_interest_area_padding,
                               skewport_target_time_in_seconds,
-                              skewport_extrapolation_limit_in_screen_pixels) {}
+                              skewport_extrapolation_limit_in_screen_pixels,
+                              max_preraster_distance) {}
 
   using PictureLayerTilingSet::ComputeSkewport;
   using PictureLayerTilingSet::ComputeSoonBorderRect;
@@ -46,7 +48,8 @@ std::unique_ptr<TestablePictureLayerTilingSet> CreateTilingSetWithSettings(
   return base::MakeUnique<TestablePictureLayerTilingSet>(
       ACTIVE_TREE, client, settings.tiling_interest_area_padding,
       settings.skewport_target_time_in_seconds,
-      settings.skewport_extrapolation_limit_in_screen_pixels);
+      settings.skewport_extrapolation_limit_in_screen_pixels,
+      settings.max_preraster_distance_in_screen_pixels);
 }
 
 std::unique_ptr<TestablePictureLayerTilingSet> CreateTilingSet(
@@ -326,10 +329,10 @@ TEST(PictureLayerTilingSetTest, TileSizeChange) {
   FakePictureLayerTilingClient active_client;
   std::unique_ptr<PictureLayerTilingSet> pending_set =
       PictureLayerTilingSet::Create(PENDING_TREE, &pending_client, 1000, 1.f,
-                                    1000);
+                                    1000, 1000.f);
   std::unique_ptr<PictureLayerTilingSet> active_set =
       PictureLayerTilingSet::Create(ACTIVE_TREE, &active_client, 1000, 1.f,
-                                    1000);
+                                    1000, 1000.f);
 
   gfx::Size layer_bounds(100, 100);
   scoped_refptr<FakeRasterSource> raster_source =
@@ -435,10 +438,10 @@ TEST(PictureLayerTilingSetTest, MaxContentScale) {
   FakePictureLayerTilingClient active_client;
   std::unique_ptr<PictureLayerTilingSet> pending_set =
       PictureLayerTilingSet::Create(PENDING_TREE, &pending_client, 1000, 1.f,
-                                    1000);
+                                    1000, 1000.f);
   std::unique_ptr<PictureLayerTilingSet> active_set =
       PictureLayerTilingSet::Create(ACTIVE_TREE, &active_client, 1000, 1.f,
-                                    1000);
+                                    1000, 1000.f);
 
   gfx::Size layer_bounds(100, 105);
   scoped_refptr<FakeRasterSource> raster_source =