[fsp] Make the selection state of providing extension icons prettier.

ui/file_manager/file_manager/foreground/css/file_types.css

Index: ui/file_manager/file_manager/foreground/css/file_types.css
diff --git a/ui/file_manager/file_manager/foreground/css/file_types.css b/ui/file_manager/file_manager/foreground/css/file_types.css
index 232ad92de853bb8f83da151e25a822a1a7ded146..c15a2c4cec84c583adb42b617f59edd5bb9548e8 100644
--- a/ui/file_manager/file_manager/foreground/css/file_types.css
+++ b/ui/file_manager/file_manager/foreground/css/file_types.css
@@ -510,7 +510,5 @@ tree:focus .tree-item[selected] > .tree-row >
 
 list:focus li[selected] [volume-type-icon='provided'],
 tree:focus .tree-item[selected] > .tree-row > [volume-type-icon='provided']{
-  /* Create a white version from a full-color icon. Works in most cases.
-     TODO(mtomasz): Replace with a shader or a JS code. */
-  -webkit-filter: grayscale(100%) contrast(10000%) invert(100%);
+  -webkit-filter: invert(100%) grayscale(100%) brightness(200%);

[hirono, 2014/06/05 10:00:27]

How about: "brightness(0) invert();" ?

[mtomasz, 2014/06/06 00:30:40]

This would make an inverted mask. Same as I tried in my previous version, but
your one is much less tricky. However, mask doesn't look very good for icons
which are big squares (such as camera app icon). The proposed filter makes it
grayscale, almost white, but not purely white. I'll show you on my workstation.

[hirono, 2014/06/06 04:25:59]

Thank you. lgtm!

 }