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 9529bc1b8a1960c67a39791c2c63982535b0ecfe..3626c3af70470e9bd87a861621a2b2f3cca34549 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 +35,14 @@ 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 take one in
+  // larger size if there's no precise match). Passing gfx::Size() as
+  // |size| is also supported and will result in chosing the smallest available
+  // 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(