Don't shrink starting_rect in the first round.

cc/resources/picture_layer_tiling_unittest.cc

Index: cc/resources/picture_layer_tiling_unittest.cc
diff --git a/cc/resources/picture_layer_tiling_unittest.cc b/cc/resources/picture_layer_tiling_unittest.cc
index 70109bddd7bb04820bdd0769ad63b9e92a7fe743..90f15edc93665afd8ed183cf5aee104d3314e5c0 100644
--- a/cc/resources/picture_layer_tiling_unittest.cc
+++ b/cc/resources/picture_layer_tiling_unittest.cc
@@ -438,6 +438,15 @@ TEST(PictureLayerTilingTest, ExpandRectOutOfBoundsExpandedPartlyCover) {
   EXPECT_TRUE(bounds.Contains(out));
 }
 
+TEST(PictureLayerTilingTest, ShrinkRectContainingBounds) {
+  gfx::Rect in(0, 0, 600, 600);
+  gfx::Rect bounds(0, 0, 10, 10);
+  int64 target_area = 20 * 20;
+  gfx::Rect out = PictureLayerTiling::ExpandRectEquallyToAreaBoundedBy(
+      in, target_area, bounds);
+  EXPECT_EQ(bounds.ToString(), out.ToString());
+}
+
 TEST(PictureLayerTilingTest, EmptyStartingRect) {
   // If a layer has a non-invertible transform, then the starting rect
   // for the layer would be empty.