[Icons NTP] Refactor large_icon_source to extract the logic shared between desktop and Android to f…

components/favicon_base/favicon_types.h

Index: components/favicon_base/favicon_types.h
diff --git a/components/favicon_base/favicon_types.h b/components/favicon_base/favicon_types.h
index ea6475429d93d931fb9f511fbe24adaa16ccd38e..f7c812abcff54c4e1c86bc16b90f56f1af91f2a7 100644
--- a/components/favicon_base/favicon_types.h
+++ b/components/favicon_base/favicon_types.h
@@ -6,12 +6,15 @@
 #define COMPONENTS_FAVICON_BASE_FAVICON_TYPES_H_
 
 #include "base/memory/ref_counted_memory.h"
+#include "base/memory/scoped_ptr.h"
 #include "ui/gfx/geometry/size.h"
 #include "ui/gfx/image/image.h"
 #include "url/gurl.h"
 
 namespace favicon_base {
 
+struct FallbackIconStyle;
+
 typedef int64 FaviconID;
 
 // Defines the icon types. They are also stored in icon_type field of favicons
@@ -72,6 +75,22 @@ struct FaviconRawBitmapResult {
 // HistoryBackend::SetFavicons().
 typedef FaviconRawBitmapResult FaviconRawBitmapData;
 
+// Result returned by LargeIconService::GetLargeIconOrFallbackStyle(). Contains
+// either the bitmap data if the favicon database has a sufficiently large
+// favicon bitmap and the style of the fallback icon otherwise.
+struct LargeIconResult {
+  LargeIconResult();
+  ~LargeIconResult();
+
+  // The bitmap from the favicon database if the database has a sufficiently
+  // large one.
+  FaviconRawBitmapResult bitmap;
+
+  // The fallback icon style if a sufficiently large icon isn't available. This
+  // uses the dominant color of a smaller icon as the background if available.
+  scoped_ptr<FallbackIconStyle> fallback_icon_style;
+};
+
 }  // namespace favicon_base
 
 #endif  // COMPONENTS_FAVICON_BASE_FAVICON_TYPES_H_