Add ability to store hidpi theme images in data pack

ui/gfx/image/image_skia_operations.h

Index: ui/gfx/image/image_skia_operations.h
diff --git a/ui/gfx/image/image_skia_operations.h b/ui/gfx/image/image_skia_operations.h
index 993655ca0ef5acc4127a14197b897b063fd749ca..042c836432e62ad5351ed415765ed88c078534b3 100644
--- a/ui/gfx/image/image_skia_operations.h
+++ b/ui/gfx/image/image_skia_operations.h
@@ -7,6 +7,7 @@
 
 #include "base/gtest_prod_util.h"
 #include "ui/base/ui_export.h"
+#include "ui/gfx/color_utils.h"
 #include "ui/gfx/shadow_value.h"
 
 namespace gfx {
@@ -36,6 +37,24 @@ class UI_EXPORT ImageSkiaOperations {
                                     int src_x, int src_y,
                                     int dst_w, int dst_h);
 
+  // Shift an image's HSL values. The shift values are in the range of 0-1,
+  // with the option to specify -1 for 'no change'. The shift values are
+  // defined as:
+  // hsl_shift[0] (hue): The absolute hue value for the image - 0 and 1 map
+  //    to 0 and 360 on the hue color wheel (red).
+  // hsl_shift[1] (saturation): A saturation shift for the image, with the
+  //    following key values:
+  //    0 = remove all color.
+  //    0.5 = leave unchanged.
+  //    1 = fully saturate the image.
+  // hsl_shift[2] (lightness): A lightness shift for the image, with the
+  //    following key values:
+  //    0 = remove all lightness (make all pixels black).
+  //    0.5 = leave unchanged.
+  //    1 = full lightness (make all pixels white).
+  static ImageSkia CreateHSLShiftedImage(const gfx::ImageSkia& image,
+                                         const color_utils::HSL& hsl_shift);
+
   // Creates a button background image by compositing the color and image
   // together, then applying the mask. This is a highly specialized composite
   // operation that is the equivalent of drawing a background in |color|,