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..e315f1692a87c0299f14a9b44543a53d15fe00f3 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 +131,13 @@ void SetDefaultsFromValue(const base::DictionaryValue* dict,
         icon.AddRepresentation(gfx::ImageSkiaRep(bitmap, kIconSizes[i].scale));
       }
     }
-    action->SetIcon(kTabId, gfx::Image(icon));
+
+    if (!icon.isNull()) {
+      gfx::ImageSkia final_icon =
+          gfx::ImageSkiaOperations::SetFallbackResizeMethod(
+              icon, skia::ImageOperations::RESIZE_LANCZOS3);
+      action->SetIcon(kTabId, gfx::Image(final_icon));
+    }
   }
 }
 
@@ -155,11 +162,9 @@ scoped_ptr<base::DictionaryValue> DefaultsToValue(ExtensionAction* action) {
   if (!icon.isNull()) {
     base::DictionaryValue* icon_value = new base::DictionaryValue();
     for (size_t i = 0; i < arraysize(kIconSizes); i++) {
-      if (icon.HasRepresentation(kIconSizes[i].scale)) {
-        icon_value->SetString(
-            kIconSizes[i].size_string,
-            RepresentationToString(icon, kIconSizes[i].scale));
-      }
+      icon_value->SetString(
+          kIconSizes[i].size_string,
+          RepresentationToString(icon, kIconSizes[i].scale));
     }
     dict->Set(kIconStorageKey, icon_value);
   }
@@ -469,7 +474,10 @@ bool ExtensionActionSetIconFunction::RunExtensionAction() {
       }
     }
 
-    extension_action_->SetIcon(tab_id_, gfx::Image(icon));
+    gfx::ImageSkia final_icon =
+        gfx::ImageSkiaOperations::SetFallbackResizeMethod(
+            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;