Resize images for hi-dpi based on a custom PNG chunk added by GRIT r78, and roll GRIT r78

ui/gfx/codec/png_codec.h

Index: ui/gfx/codec/png_codec.h
diff --git a/ui/gfx/codec/png_codec.h b/ui/gfx/codec/png_codec.h
index 3a6d295dbdf45a1e3d77d1711f7474bc190918c6..c24e20d73ba584b30f17e9a097c7cbb4343eddad 100644
--- a/ui/gfx/codec/png_codec.h
+++ b/ui/gfx/codec/png_codec.h
@@ -115,9 +115,16 @@ class UI_EXPORT PNGCodec {
   // images are. (There are a lot of themes that have a NTP image of about ~1
   // megabyte, and those require a 7-10 megabyte side buffer.)
   //
+  // If |scale_fallback| is not NULL, it is set to true if a csCl chunk is
+  // present in the image, false if not.
+  //
   // Returns true if data is non-null and can be decoded as a png, false
   // otherwise.
   static bool Decode(const unsigned char* input, size_t input_size,
+                     SkBitmap* bitmap, bool* scale_fallback);
+
+  // Most clients don't need the |scale_fallback| argument.

[oshima, 2012/10/09 18:28:35]

// Same as Decode above, but scale_fallback is NULL.
// Should be used this instead if you don't need to know
// if the image has csCl chunk.
(in better English)

[benrg, 2012/10/09 21:37:18]

Done.

+  static bool Decode(const unsigned char* input, size_t input_size,
                      SkBitmap* bitmap);
 
   // Create a SkBitmap from a decoded BGRA DIB. The caller owns the returned