Make some updates to extension iconography.

extensions/browser/image_loader.cc

Index: extensions/browser/image_loader.cc
diff --git a/extensions/browser/image_loader.cc b/extensions/browser/image_loader.cc
index f090ffba1ef7390671712b45d50e430151003e35..fe72e57b7a776e936d3ce274c9dc7289f86a264a 100644
--- a/extensions/browser/image_loader.cc
+++ b/extensions/browser/image_loader.cc
@@ -19,7 +19,9 @@
 #include "extensions/browser/extensions_browser_client.h"
 #include "extensions/browser/image_loader_factory.h"
 #include "extensions/common/extension.h"
+#include "extensions/common/manifest_handlers/icons_handler.h"
 #include "skia/ext/image_operations.h"
+#include "ui/base/layout.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/gfx/codec/png_codec.h"
 #include "ui/gfx/image/image_family.h"
@@ -239,6 +241,23 @@ void ImageLoader::LoadImageAsync(const Extension* extension,
   LoadImagesAsync(extension, info_list, callback);
 }
 
+void ImageLoader::LoadImageAtEveryScaleFactorAsync(
+    const Extension* extension,
+    const gfx::Size& dip_size,
+    const ImageLoaderImageCallback& callback) {
+  std::vector<ImageRepresentation> info_list;
+  for (auto scale : ui::GetSupportedScaleFactors()) {
+    const float scale_factor = ui::GetScaleForScaleFactor(scale);
+    const gfx::Size px_size = gfx::ScaleToFlooredSize(dip_size, scale_factor);
+    extensions::ExtensionResource image =

[Devlin, 2016/12/15 17:14:41]

no need for extensions:: prefix

[Evan Stade, 2016/12/15 23:49:02]

Done.

+        extensions::IconsInfo::GetIconResource(extension, px_size.width(),
+                                               ExtensionIconSet::MATCH_BIGGER);
+    info_list.push_back(ImageRepresentation(
+        image, ImageRepresentation::ALWAYS_RESIZE, px_size, scale));
+  }
+  LoadImagesAsync(extension, info_list, callback);
+}
+
 void ImageLoader::LoadImagesAsync(
     const Extension* extension,
     const std::vector<ImageRepresentation>& info_list,