cc: Make 1/4th default low res scale.

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 3272712258474ed01847db86a5470563f746d461..533d82bf0ad43003ab4aa4fccb4b8257ca1506d6 100644
--- a/cc/layers/picture_layer_impl_unittest.cc
+++ b/cc/layers/picture_layer_impl_unittest.cc
@@ -677,12 +677,12 @@ TEST_F(PictureLayerImplTest, DontAddLowResDuringAnimation) {
   EXPECT_BOTH_EQ(num_tilings(), 2u);
 
   // Page scale animation, new high res, but not new low res because animating.
-  contents_scale = 4.f;
-  page_scale = 4.f;
+  contents_scale = 2.f;

[vmpstr, 2013/08/05 18:41:27]

This change is here since with the new low res contents scale of 0.25, it just
happens to look like going 4 -> 1 creates a new tiling, where in reality the old
high res becomes the new low res (with no new tiling created)

+  page_scale = 2.f;
   animating_transform = true;
   SetContentsScaleOnBothLayers(
       contents_scale, device_scale, page_scale, animating_transform);
-  EXPECT_BOTH_EQ(HighResTiling()->contents_scale(), 4.f);
+  EXPECT_BOTH_EQ(HighResTiling()->contents_scale(), 2.f);
   EXPECT_BOTH_EQ(LowResTiling()->contents_scale(), low_res_factor);
   EXPECT_BOTH_EQ(num_tilings(), 3u);
 
@@ -690,8 +690,8 @@ TEST_F(PictureLayerImplTest, DontAddLowResDuringAnimation) {
   animating_transform = false;
   SetContentsScaleOnBothLayers(
       contents_scale, device_scale, page_scale, animating_transform);
-  EXPECT_BOTH_EQ(HighResTiling()->contents_scale(), 4.f);
-  EXPECT_BOTH_EQ(LowResTiling()->contents_scale(), 4.f * low_res_factor);
+  EXPECT_BOTH_EQ(HighResTiling()->contents_scale(), 2.f);
+  EXPECT_BOTH_EQ(LowResTiling()->contents_scale(), 2.f * low_res_factor);
   EXPECT_BOTH_EQ(num_tilings(), 4u);
 }