ThumbnailImage: Fix a nullptr check that could cause a crash

ThumbnailImage::UncompressImage will lead a crash within
gfx::ImageSkia::CreateFrom1xBitmap, because gfx::JPEGCodec::Decode may
return nullptr, but ThumbnailImage::UncompressImage do not check it.

Bug: 1493915
Change-Id: Ic857b003a82e74d6170fa8e361033bed998bef80
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4944757
Commit-Queue: Eshwar Stalin <estalin@chromium.org>
Reviewed-by: Dana Fried <dfried@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1213954}

diff --git a/AUTHORS b/AUTHORS
index a764248..3338966 100644
--- a/AUTHORS
+++ b/AUTHORS

@@ -617,6 +617,7 @@
 Jianneng Zhong <muzuiget@gmail.com>
 Jiawei Shao <jiawei.shao@intel.com>
 Jiawei Chen <jiawei.chen@dolby.com>
+Jiawei Wang <hellojw513@gmail.com>
 Jiaxun Wei <leuisken@gmail.com>
 Jiaxun Yang <jiaxun.yang@flygoat.com>
 Jidong Qin <qinjidong@qianxin.com>

diff --git a/chrome/browser/ui/thumbnails/thumbnail_image.cc b/chrome/browser/ui/thumbnails/thumbnail_image.cc
index f67684c..dd6a109 100644
--- a/chrome/browser/ui/thumbnails/thumbnail_image.cc
+++ b/chrome/browser/ui/thumbnails/thumbnail_image.cc

@@ -232,9 +232,13 @@
 // static
 gfx::ImageSkia ThumbnailImage::UncompressImage(
     CompressedThumbnailData compressed) {
-  gfx::ImageSkia result =
-      gfx::ImageSkia::CreateFrom1xBitmap(*gfx::JPEGCodec::Decode(
-          compressed->data.data(), compressed->data.size()));
+  gfx::ImageSkia result;
+  std::unique_ptr<SkBitmap> bitmap(
+      gfx::JPEGCodec::Decode(compressed->data.data(), compressed->data.size()));
+  if (bitmap.get()) {
+    result = gfx::ImageSkia::CreateFrom1xBitmap(*bitmap);
+  }
+
   result.MakeThreadSafe();
   return result;
 }