Use LANCZOS3 resize algorithm to generate missing image reps for extension action icons.

chrome/browser/extensions/api/extension_action/extension_actions_api.cc

Index: chrome/browser/extensions/api/extension_action/extension_actions_api.cc
diff --git a/chrome/browser/extensions/api/extension_action/extension_actions_api.cc b/chrome/browser/extensions/api/extension_action/extension_actions_api.cc
index 3b7a2b496747281dec1cf95d8f53e664872284a6..195a623a8443959e04bbe6efe7c743a4669de452 100644
--- a/chrome/browser/extensions/api/extension_action/extension_actions_api.cc
+++ b/chrome/browser/extensions/api/extension_action/extension_actions_api.cc
@@ -27,6 +27,7 @@
 #include "chrome/common/render_messages.h"
 #include "content/public/browser/navigation_entry.h"
 #include "content/public/browser/notification_service.h"
+#include "ui/gfx/image/image_skia_operations.h"
 
 namespace {
 
@@ -130,7 +131,11 @@ void SetDefaultsFromValue(const base::DictionaryValue* dict,
         icon.AddRepresentation(gfx::ImageSkiaRep(bitmap, kIconSizes[i].scale));
       }
     }
-    action->SetIcon(kTabId, gfx::Image(icon));
+
+    gfx::ImageSkia final_icon =
+        gfx::ImageSkiaOperations::CreateImageWithFallbackResizeMethod(
+            icon, skia::ImageOperations::RESIZE_LANCZOS3);
+    action->SetIcon(kTabId, gfx::Image(final_icon));
   }
 }
 
@@ -469,7 +474,10 @@ bool ExtensionActionSetIconFunction::RunExtensionAction() {
       }
     }
 
-    extension_action_->SetIcon(tab_id_, gfx::Image(icon));
+    gfx::ImageSkia final_icon =
+        gfx::ImageSkiaOperations::CreateImageWithFallbackResizeMethod(
+            icon, skia::ImageOperations::RESIZE_LANCZOS3);
+    extension_action_->SetIcon(tab_id_, gfx::Image(final_icon));
   } else if (details_->GetInteger("iconIndex", &icon_index)) {
     // Obsolete argument: ignore it.
     return true;