chromeos: Fix pixelated icons in app list and launcher (part 1)

chrome/browser/extensions/image_loading_tracker.h

Index: chrome/browser/extensions/image_loading_tracker.h
diff --git a/chrome/browser/extensions/image_loading_tracker.h b/chrome/browser/extensions/image_loading_tracker.h
index 8c92bf66ef72c1f875542aeb3aa288df217f6622..85fec94e4612382321acbf5f15ee819524fb32aa 100644
--- a/chrome/browser/extensions/image_loading_tracker.h
+++ b/chrome/browser/extensions/image_loading_tracker.h
@@ -7,6 +7,8 @@
 #pragma once
 
 #include <map>
+#include <string>
+#include <vector>
 
 #include "base/compiler_specific.h"
 #include "base/gtest_prod_util.h"
@@ -14,6 +16,7 @@
 #include "chrome/common/extensions/extension_resource.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
+#include "ui/gfx/image/image_skia.h"
 #include "ui/gfx/size.h"
 
 class SkBitmap;
@@ -65,12 +68,18 @@ class ImageLoadingTracker : public content::NotificationObserver {
 
   // Information about a single image to load from a extension resource.
   struct ImageInfo {
-    ImageInfo(const ExtensionResource& resource, gfx::Size max_size);
+    ImageInfo(const ExtensionResource& resource, const gfx::Size& max_size);
+    ImageInfo(const ExtensionResource& resource,
+              const gfx::Size& max_size,
+              float scale);
     ~ImageInfo();
+
     ExtensionResource resource;
     // If the loaded image is larger than |max_size| it will be resized to those
     // dimensions.
     gfx::Size max_size;
+    // |scale| is used to construct loaded gfx::ImageSkia.
+    float scale;
   };
 
   explicit ImageLoadingTracker(Observer* observer);
@@ -85,6 +94,14 @@ class ImageLoadingTracker : public content::NotificationObserver {
                  const gfx::Size& max_size,
                  CacheParam cache);
 
+  // Loads an extension image for given DIP size. On non-DIP enabled screen,
+  // this is the same as above LoadImage. On DIP screen, this function would try
+  // to load hi-res icons with proper scale factor.
+  void LoadDIPImage(const extensions::Extension* extension,
+                    int preferred_dip_size,
+                    gfx::Size max_dip_size,
+                    CacheParam cache);
+
   // Same as LoadImage() above except it loads multiple images from the same
   // extension. This is used to load multiple resolutions of the same image
   // type.
@@ -109,7 +126,7 @@ class ImageLoadingTracker : public content::NotificationObserver {
     std::string extension_id;
     CacheParam cache;
     size_t pending_count;
-    std::vector<SkBitmap> bitmaps;
+    gfx::ImageSkia images;
   };
 
   // Maps an integer identifying a load request to a PendingLoadInfo.
@@ -123,7 +140,7 @@ class ImageLoadingTracker : public content::NotificationObserver {
   // it was the last image in the list. The |original_size| should be the size
   // of the image before any resizing was done.
   // |image| may be null if the file failed to decode.
-  void OnImageLoaded(SkBitmap* image, const ExtensionResource& resource,
+  void OnImageLoaded(SkBitmap* image, const ImageInfo& image_info,
                      const gfx::Size& original_size, int id, bool should_cache);
 
   // Checks whether image is a component extension resource. Returns false