Set desired_image_size when decoding images for NTP Tile icons.

components/image_fetcher/image_fetcher.h

Index: components/image_fetcher/image_fetcher.h
diff --git a/components/image_fetcher/image_fetcher.h b/components/image_fetcher/image_fetcher.h
index 69836385acf20be729c8977025b9c8827216a916..41cd22c49e7d29bc708afb3c973468b566addc69 100644
--- a/components/image_fetcher/image_fetcher.h
+++ b/components/image_fetcher/image_fetcher.h
@@ -15,6 +15,7 @@
 
 namespace gfx {
 class Image;
+class Size;
 }
 
 namespace image_fetcher {
@@ -34,6 +35,12 @@ class ImageFetcher {
   virtual void SetDataUseServiceName(
       DataUseServiceName data_use_service_name) = 0;
 
+  // Sets the desired size for images with multiple frames (like .ico files).
+  // By default, the image fetcher choses smaller images. Override to choose a
+  // frame with a size as close as possible to |size| (trying to find one that's
+  // larger than |size|).
+  virtual void SetDesiredImageFrameSize(const gfx::Size& size) = 0;
+
   // An empty gfx::Image will be returned to the callback in case the image
   // could not be fetched.
   virtual void StartOrQueueNetworkRequest(