Add ability to constrain dominant color selection to a HSL range.

ui/app_list/views/tile_item_view.cc

Index: ui/app_list/views/tile_item_view.cc
diff --git a/ui/app_list/views/tile_item_view.cc b/ui/app_list/views/tile_item_view.cc
index 71073436b34ec2ec210d84964d0e9d77eb700688..17dcc8ce61f196ac72093f25a2b298b50e1c3730 100644
--- a/ui/app_list/views/tile_item_view.cc
+++ b/ui/app_list/views/tile_item_view.cc
@@ -105,8 +105,12 @@ void TileItemView::SetAppListItem(AppListItem* item) {
   icon_->SetImage(item_->icon());
   title_->SetText(base::UTF8ToUTF16(item_->name()));
 
-  background_->set_strip_color(
-      color_utils::CalculateKMeanColorOfBitmap(*item_->icon().bitmap()));
+  color_utils::GridSampler sampler;
+  background_->set_strip_color(color_utils::CalculateKMeanColorOfPNG(

[Matt Giuca, 2014/05/22 05:03:52]

Ew, please don't convert to a PNG just to get around the fact that there is no
way to give explicit values to CalculateKMeanColorOfBitmap. See my comment on
that function.

Also: I think you should save this change for a follow-up CL. This CL should
just be changing the algorithm, not actually changing the parameters used by any
specific client. So in this CL, call the default overload of
CalculateKMeanColorOfBitmap.

[calamity, 2014/05/22 07:36:36]

Added overload in precursor CL.

+      gfx::Image(item_->icon()).As1xPNGBytes(),
+      color_utils::HSL{-1, 0.3, 0.2},
+      color_utils::HSL{-1, 1, 0.8},
+      &sampler));
 }
 
 gfx::Size TileItemView::GetPreferredSize() {