Extend FaviconService to support fetching favicons from a Google server

components/favicon_base/favicon_util.h

Index: components/favicon_base/favicon_util.h
diff --git a/components/favicon_base/favicon_util.h b/components/favicon_base/favicon_util.h
index 088b471c47dabfb4d8462a95ae3bdcd2ec4d8064..b1dd6d629f4defc89c601c16dc6fdc4731e10d87 100644
--- a/components/favicon_base/favicon_util.h
+++ b/components/favicon_base/favicon_util.h
@@ -45,6 +45,15 @@ favicon_base::FaviconRawBitmapResult ResizeFaviconBitmapResult(
         favicon_bitmap_results,
     int desired_size_in_pixel);
 
-}  // namspace favicon_base
+// Returns a resampled bitmap of |desired_size| x |desired_size| by resampling
+// the best bitmap out of |input_bitmaps|.
+// ResizeBitmapByDownsamplingIfPossible() is similar to SelectFaviconFrames()
+// but it operates on bitmaps which have already been resampled via
+// SelectFaviconFrames().
+SkBitmap ResizeBitmapByDownsamplingIfPossible(
+    const std::vector<SkBitmap>& input_bitmaps,
+    int desired_size);
+
+}  // namespace favicon_base
 
 #endif  // COMPONENTS_FAVICON_BASE_FAVICON_UTIL_H_