cc: Remove tile sharing from tilings.

cc/trees/layer_tree_host_unittest_picture.cc

Index: cc/trees/layer_tree_host_unittest_picture.cc
diff --git a/cc/trees/layer_tree_host_unittest_picture.cc b/cc/trees/layer_tree_host_unittest_picture.cc
index 7d3d5254f4f0d7a25331d78462ae8562a32bd499..6f222f71e719e47a6b44c3675b6e545cface7c8b 100644
--- a/cc/trees/layer_tree_host_unittest_picture.cc
+++ b/cc/trees/layer_tree_host_unittest_picture.cc
@@ -242,8 +242,8 @@ class LayerTreeHostPictureTestChangeLiveTilesRectWithRecycleTree
         EXPECT_TRUE(tiling->TileAt(0, 0));
         EXPECT_FALSE(tiling->TileAt(0, num_tiles_y));
 
-        // The recycled tiling matches it.
-        EXPECT_TRUE(recycled_tiling->TileAt(0, 0));
+        // The recycled tiling has no tiles.
+        EXPECT_FALSE(recycled_tiling->TileAt(0, 0));
         EXPECT_FALSE(recycled_tiling->TileAt(0, num_tiles_y));
 
         // The live tiles rect matches on the recycled tree.
@@ -266,10 +266,6 @@ class LayerTreeHostPictureTestChangeLiveTilesRectWithRecycleTree
         // either.
         EXPECT_FALSE(recycled_tiling->TileAt(0, 0));
 
-        // The live tiles rect matches on the recycled tree.
-        EXPECT_EQ(tiling->live_tiles_rect(),
-                  recycled_tiling->live_tiles_rect());
-
         // Make the top of the layer visible again.
         picture_impl->SetPosition(gfx::PointF());
         impl->SetNeedsRedraw();
@@ -284,8 +280,8 @@ class LayerTreeHostPictureTestChangeLiveTilesRectWithRecycleTree
         EXPECT_TRUE(tiling->TileAt(0, 0));
         EXPECT_FALSE(tiling->TileAt(0, num_tiles_y));
 
-        // The recycled tiling should also have tiles at the top.
-        EXPECT_TRUE(recycled_tiling->TileAt(0, 0));
+        // The recycled tiling should have no tiles.
+        EXPECT_FALSE(recycled_tiling->TileAt(0, 0));
         EXPECT_FALSE(recycled_tiling->TileAt(0, num_tiles_y));
 
         // The live tiles rect matches on the recycled tree.
@@ -308,9 +304,15 @@ class LayerTreeHostPictureTestChangeLiveTilesRectWithRecycleTree
     PictureLayerTiling* tiling = picture_impl->HighResTiling();
     int num_tiles_y = tiling->TilingDataForTesting().num_tiles_y();
 
-    // The pending layer should always have tiles at the top of it each commit.
-    // The tile is part of the required for activation set so it should exist.
-    EXPECT_TRUE(tiling->TileAt(0, 0));
+    if (!impl->active_tree()->root_layer()) {
+      // If active tree doesn't have the layer, then pending tree should have
+      // all needed tiles.
+      EXPECT_TRUE(tiling->TileAt(0, 0));
+    } else {
+      // Since there was no invalidation, the pending tree shouldn't have any
+      // tiles.
+      EXPECT_FALSE(tiling->TileAt(0, 0));
+    }
     EXPECT_FALSE(tiling->TileAt(0, num_tiles_y));
 
     if (did_post_commit_)