Compressing .pak resources with new option: "type=GZIPPABLE_BINDATA"

ui/base/resource/resource_bundle.h

Index: ui/base/resource/resource_bundle.h
diff --git a/ui/base/resource/resource_bundle.h b/ui/base/resource/resource_bundle.h
index f58b1269fc8c9f2e3e18f786dff23ab19b5e28ac..7187c9155e8f543475106740f7cec702250f1d81 100644
--- a/ui/base/resource/resource_bundle.h
+++ b/ui/base/resource/resource_bundle.h
@@ -50,6 +50,8 @@ class UI_BASE_EXPORT ResourceBundle {
   static const int kMediumFontDelta = 3;
   static const int kLargeFontDelta = 8;
 
+  static constexpr const char* CUSTOM_GZIP_HEADER = "\xff\x1f\x8b";
+
   // Legacy font style mappings. TODO(tapted): Phase these out in favour of
   // client code providing their own constant with the desired font size delta.
   enum FontStyle {
@@ -228,7 +230,7 @@ class UI_BASE_EXPORT ResourceBundle {
       ScaleFactor scale_factor) const;
 
   // Return the contents of a scale independent resource in a
-  // StringPiece given the resource id
+  // StringPiece given the resource id.
   base::StringPiece GetRawDataResource(int resource_id) const;
 
   // Return the contents of a resource in a StringPiece given the resource id
@@ -382,6 +384,15 @@ class UI_BASE_EXPORT ResourceBundle {
                   SkBitmap* bitmap,
                   bool* fell_back_to_1x) const;
 
+  // Loads the raw bytes of a data resource nearest the scale factor
+  // |scale_factor| into |bytes|, without doing any processing or
+  // interpretation of the resource. Use ResourceHandle::SCALE_FACTOR_NONE
+  // for scale independent image resources (such as wallpaper).
+  // Returns NULL if we fail to read the resource.
+  base::StringPiece GetRawDataResourceForScaleImpl(
+      int resource_id,
+      ScaleFactor scale_factor) const;
+
   // Returns true if missing scaled resources should be visually indicated when
   // drawing the fallback (e.g., by tinting the image).
   static bool ShouldHighlightMissingScaledResources();