[NTP::Downloads] Replace 36dp file type resources with vector drawables.

chrome/android/java/src/org/chromium/chrome/browser/ntp/snippets/SnippetArticleViewHolder.java

Index: chrome/android/java/src/org/chromium/chrome/browser/ntp/snippets/SnippetArticleViewHolder.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/ntp/snippets/SnippetArticleViewHolder.java b/chrome/android/java/src/org/chromium/chrome/browser/ntp/snippets/SnippetArticleViewHolder.java
index 9eb08599a8f98e583bcf90b71aa3ab981d265e29..c3f0614bd57eb52b40ca9e05cf6f0ea0067e2b06 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/ntp/snippets/SnippetArticleViewHolder.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/ntp/snippets/SnippetArticleViewHolder.java
@@ -87,6 +87,7 @@ public class SnippetArticleViewHolder extends CardViewHolder implements Impressi
     private final boolean mUseFaviconService;
     private final ColorStateList mIconForegroundColorList;
     private final int mIconBackgroundColor;
+    private final int mFileTypeIconPaddingPx;
 
     private FetchImageCallback mImageCallback;
     private SnippetArticle mArticle;
@@ -124,6 +125,8 @@ public class SnippetArticleViewHolder extends CardViewHolder implements Impressi
         mIconForegroundColorList = DownloadUtils.getIconForegroundColorList(parent.getContext());
         mThumbnailProvider = new ThumbnailProviderImpl(
                 Math.min(mThumbnailView.getMaxWidth(), mThumbnailView.getMaxHeight()));
+        mFileTypeIconPaddingPx = mThumbnailView.getResources().getDimensionPixelSize(
+                R.dimen.snippets_thumbnail_file_type_icon_padding);
 
         new ImpressionTracker(itemView, this);
         new DisplayStyleObserverAdapter(itemView, uiConfig, new DisplayStyleObserver() {
@@ -295,25 +298,10 @@ public class SnippetArticleViewHolder extends CardViewHolder implements Impressi
 
     private void setThumbnailFromFileType(int fileType) {
         mThumbnailView.setScaleType(ImageView.ScaleType.CENTER_INSIDE);
-
-        // The provided asset is 36dp, but the spec requires 32dp. Add padding to force the asset to
-        // be scaled down.
-        final int actualIconSizeDp = 36;
-        final int desiredIconSizeDp = 32;
-        Drawable icon = ApiCompatibilityUtils.getDrawable(mThumbnailView.getResources(),
-                DownloadUtils.getIconResId(fileType, DownloadUtils.ICON_SIZE_36_DP));
-
-        final int drawableSize = icon.getIntrinsicWidth();
-        assert icon.getIntrinsicHeight() == drawableSize;
-
-        final int viewSize = mThumbnailView.getResources().getDimensionPixelSize(
-                R.dimen.snippets_thumbnail_size);
-        final float scale = ((float) desiredIconSizeDp) / actualIconSizeDp;
-        final int padding = (int) (viewSize / 2f - drawableSize * scale / 2f);
-        mThumbnailView.setPadding(padding, padding, padding, padding);
-
+        mThumbnailView.setPadding(mFileTypeIconPaddingPx, mFileTypeIconPaddingPx,
+                mFileTypeIconPaddingPx, mFileTypeIconPaddingPx);
         mThumbnailView.setBackgroundColor(mIconBackgroundColor);
-        mThumbnailView.setImageDrawable(icon);
+        mThumbnailView.setImageResource(DownloadUtils.getIconResId(fileType));
         mThumbnailView.setTint(mIconForegroundColorList);
     }