Always select best favicon bitmap

components/favicon_base/select_favicon_frames.h

Index: components/favicon_base/select_favicon_frames.h
diff --git a/components/favicon_base/select_favicon_frames.h b/components/favicon_base/select_favicon_frames.h
index 573a38c79cddf839622488589b71b4d19fbdfba6..f0dbf3a0a879e2c6c16e287c66bd970b556d1e82 100644
--- a/components/favicon_base/select_favicon_frames.h
+++ b/components/favicon_base/select_favicon_frames.h
@@ -61,4 +61,13 @@ void SelectFaviconFrameIndices(const std::vector<gfx::Size>& frame_pixel_sizes,
                                std::vector<size_t>* best_indices,
                                float* score);
 
+// Returns an arbitrary, implementation specific score between [0..1] that is
+// higher for better matches, and 1.0f for exact matches. Order of preference:
+// 1) Non-huge bitmaps are preferred over huge ones (8x bigger than
+//    desired_size).
+// 2) Bitmaps which need to be scaled down instead of up.
+// 3) Bitmaps which do not need to be scaled as much.
+float GetFaviconCandidateScore(const gfx::Size& candidate_size,
+                               int desired_size);
+
 #endif  // COMPONENTS_FAVICON_BASE_SELECT_FAVICON_FRAMES_H_