Add file icons to chrome://downloads/ on the Mac. Add Skia helper CGImageToSkBitmap().

skia/ext/skia_utils_mac.h

Index: skia/ext/skia_utils_mac.h
diff --git a/skia/ext/skia_utils_mac.h b/skia/ext/skia_utils_mac.h
index b678abb9d73f66a56929a303c1a076be8abc4fe5..26b6f1602b949302c13908aeb2b467ac16be43c1 100644
--- a/skia/ext/skia_utils_mac.h
+++ b/skia/ext/skia_utils_mac.h
@@ -13,6 +13,12 @@ struct SkMatrix;
 struct SkIRect;
 struct SkPoint;
 struct SkRect;
+class SkBitmap;
+typedef struct _NSSize NSSize;
+
+#ifdef __OBJC__
+@class NSImage;
+#endif
 
 namespace gfx {
 
@@ -45,6 +51,14 @@ SkColor CGColorRefToSkColor(CGColorRef color);
 // Converts ARGB to CGColorRef.
 CGColorRef SkColorToCGColorRef(SkColor color);
 
+// Converts a CGImage to a SkBitmap.
+SkBitmap CGImageToSkBitmap(CGImageRef image);
+
+#ifdef __OBJC__
+// Draws an NSImage with a given size into a SkBitmap.
+SkBitmap NSImageToSkBitmap(NSImage* image, NSSize size, bool is_opaque);
+#endif
+
 }  // namespace gfx
 
 #endif  // SKIA_EXT_SKIA_UTILS_MAC_H_