cc: Simplify picture layer tiling update tile priorities.

cc/test/test_tile_priorities.cc

Index: cc/test/test_tile_priorities.cc
diff --git a/cc/test/test_tile_priorities.cc b/cc/test/test_tile_priorities.cc
index 9d3aae2dd3a4681fd80342238dce427ed125c482..9f644d38e069c185aa8f81917876a03e88e9123d 100644
--- a/cc/test/test_tile_priorities.cc
+++ b/cc/test/test_tile_priorities.cc
@@ -7,16 +7,16 @@
 namespace cc {
 
 TilePriorityForSoonBin::TilePriorityForSoonBin()
-    : TilePriority(HIGH_RESOLUTION, 0.5, 300.0) {}
+    : TilePriority(HIGH_RESOLUTION, SOON, 300.0) {}
 
 TilePriorityForEventualBin::TilePriorityForEventualBin()
-    : TilePriority(HIGH_RESOLUTION, 2.0, 315.0) {}
+    : TilePriority(HIGH_RESOLUTION, EVENTUALLY, 315.0) {}
 
 TilePriorityForNowBin::TilePriorityForNowBin()
-    : TilePriority(HIGH_RESOLUTION, 0, 0) {}
+    : TilePriority(HIGH_RESOLUTION, NOW, 0) {}
 
 TilePriorityRequiredForActivation::TilePriorityRequiredForActivation()
-    : TilePriority(HIGH_RESOLUTION, 0, 0) {
+    : TilePriority(HIGH_RESOLUTION, NOW, 0) {
   required_for_activation = true;
 }