cc: fix content_to_screen_scale in UpdateTilePriorities.

cc/resources/picture_layer_tiling_unittest.cc

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/resources/picture_layer_tiling.h"
 
 #include <limits>
 #include <set>
 
 #include "cc/base/math_util.h"
@@ skipping 604 matching lines @@
   EXPECT_FLOAT_EQ(28.f, priority.distance_to_visible);
 
   priority = tiling->TileAt(3, 4)->priority(ACTIVE_TREE);
   EXPECT_FLOAT_EQ(0.f, priority.distance_to_visible);
 
   // Change the underlying layer scale.
   tiling->UpdateTilePriorities(
       ACTIVE_TREE, viewport, 2.0f, 3.0, NULL, NULL, gfx::Transform());
 
   priority = tiling->TileAt(5, 1)->priority(ACTIVE_TREE);
-  EXPECT_FLOAT_EQ(34.f, priority.distance_to_visible);
+  EXPECT_FLOAT_EQ(136.f, priority.distance_to_visible);
 
   priority = tiling->TileAt(2, 5)->priority(ACTIVE_TREE);
-  EXPECT_FLOAT_EQ(14.f, priority.distance_to_visible);
+  EXPECT_FLOAT_EQ(56.f, priority.distance_to_visible);
 
   priority = tiling->TileAt(3, 4)->priority(ACTIVE_TREE);
   EXPECT_FLOAT_EQ(0.f, priority.distance_to_visible);
+
+  // Test additional scales.
+  tiling = TestablePictureLayerTiling::Create(0.2f, layer_bounds, &client);
+  tiling->UpdateTilePriorities(
+      ACTIVE_TREE, viewport, 1.0f, 4.0, NULL, NULL, gfx::Transform());
+
+  priority = tiling->TileAt(5, 1)->priority(ACTIVE_TREE);
+  EXPECT_FLOAT_EQ(110.f, priority.distance_to_visible);
+
+  priority = tiling->TileAt(2, 5)->priority(ACTIVE_TREE);
+  EXPECT_FLOAT_EQ(70.f, priority.distance_to_visible);
+
+  priority = tiling->TileAt(3, 4)->priority(ACTIVE_TREE);
+  EXPECT_FLOAT_EQ(60.f, priority.distance_to_visible);
+
+  tiling->UpdateTilePriorities(
+      ACTIVE_TREE, viewport, 0.5f, 5.0, NULL, NULL, gfx::Transform());
+
+  priority = tiling->TileAt(5, 1)->priority(ACTIVE_TREE);
+  EXPECT_FLOAT_EQ(55.f, priority.distance_to_visible);
+
+  priority = tiling->TileAt(2, 5)->priority(ACTIVE_TREE);
+  EXPECT_FLOAT_EQ(35.f, priority.distance_to_visible);
+
+  priority = tiling->TileAt(3, 4)->priority(ACTIVE_TREE);
+  EXPECT_FLOAT_EQ(30.f, priority.distance_to_visible);
 }
 
 TEST(PictureLayerTilingTest, ExpandRectEqual) {
   gfx::Rect in(40, 50, 100, 200);
   gfx::Rect bounds(-1000, -1000, 10000, 10000);
   int64 target_area = 100 * 200;
   gfx::Rect out = PictureLayerTiling::ExpandRectEquallyToAreaBoundedBy(
       in, target_area, bounds, NULL);
   EXPECT_EQ(in.ToString(), out.ToString());
 }
@@ skipping 1275 matching lines @@
   for (std::vector<scoped_refptr<Tile> >::const_iterator it = tiles.begin();
        it != tiles.end();
        ++it) {
     EXPECT_EQ(TilePriority(), (*it)->priority(ACTIVE_TREE));
   }
   tiles.clear();
 }
 
 }  // namespace
 }  // namespace cc