Gtk3 ui: Add libgtk3ui as a separate build component

chrome/browser/ui/libgtkui/skia_utils_gtk2.cc

Index: chrome/browser/ui/libgtkui/skia_utils_gtk2.cc
diff --git a/chrome/browser/ui/libgtk2ui/skia_utils_gtk2.cc b/chrome/browser/ui/libgtkui/skia_utils_gtk2.cc
similarity index 97%
rename from chrome/browser/ui/libgtk2ui/skia_utils_gtk2.cc
rename to chrome/browser/ui/libgtkui/skia_utils_gtk2.cc
index f896979550b99083ed4daf7b8fd409ba2907145a..d4e04754696b7ae3877246ddfea1f2ac0abc2b18 100644
--- a/chrome/browser/ui/libgtk2ui/skia_utils_gtk2.cc
+++ b/chrome/browser/ui/libgtkui/skia_utils_gtk2.cc
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "chrome/browser/ui/libgtk2ui/skia_utils_gtk2.h"
+#include "chrome/browser/ui/libgtkui/skia_utils_gtk2.h"
 
 #include <gdk/gdk.h>
 
@@ -10,7 +10,7 @@
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "third_party/skia/include/core/SkUnPreMultiply.h"
 
-namespace libgtk2ui {
+namespace libgtkui {
 
 // GDK_COLOR_RGB multiplies by 257 (= 0x10001) to distribute the bits evenly
 // See: http://www.mindcontrol.org/~hplus/graphics/expand-bits.html
@@ -130,4 +130,4 @@ GdkPixbuf* GdkPixbufFromSkBitmap(const SkBitmap& bitmap) {
   return pixbuf;
 }
 
-}  // namespace libgtk2ui
+}  // namespace libgtkui