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..130826ebb975a8c1cc19f5c5b682fc38c9d89b13 100644
--- a/ui/gfx/codec/png_codec.h
+++ b/ui/gfx/codec/png_codec.h
@@ -117,6 +117,15 @@ class UI_EXPORT PNGCodec {
   //
   // Returns true if data is non-null and can be decoded as a png, false
   // otherwise.
+  //
+  // If the call succeeds and |fell_back_to_1x| is not NULL, it is set to true
+  // if Chrome's custom csCl PNG chunk is present (indicating that GRIT fell
+  // back to the 100% image), false if not.
+  static bool Decode(const unsigned char* input, size_t input_size,
+                     SkBitmap* bitmap, bool* fell_back_to_1x);
+
+  // Equivalent to Decode(input, input_size, bitmap, NULL), for clients that
+  // don't need fell_back_to_1x returned (which is most clients).
   static bool Decode(const unsigned char* input, size_t input_size,
                      SkBitmap* bitmap);