Add ImageSkiaRep::unscaled that tells if the image is for unscaled image.

ui/gfx/image/image_skia_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/gfx/image/image_skia.h"
 
 #include "base/logging.h"
 #include "base/threading/simple_thread.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "third_party/skia/include/core/SkBitmap.h"
@@ skipping 357 matching lines @@
   EXPECT_TRUE(threadsafe_on_thread.can_read());
   EXPECT_FALSE(threadsafe_on_thread.can_modify());
   EXPECT_TRUE(image.CanRead());
   EXPECT_FALSE(image.CanModify());
 }
 #endif  // ENABLE_NON_THREAD_SAFE
 
 // Just in case we ever get lumped together with other compilation units.
 #undef ENABLE_NON_THREAD_SAFE
 
+TEST(ImageSkiaTest, Unscaled) {
+  SkBitmap bitmap;
+
+  // An ImageSkia created with 1x bitmap is unscaled.
+  ImageSkia image_skia = ImageSkia::CreateFrom1xBitmap(bitmap);
+  EXPECT_TRUE(image_skia.GetRepresentation(1.0f).unscaled());
+  ImageSkiaRep rep_2x(Size(100, 100), 2.0f);
+
+  // When reps for other scales are added, the unscaled image
+  // becomes scaled.
+  image_skia.AddRepresentation(rep_2x);
+  EXPECT_FALSE(image_skia.GetRepresentation(1.0f).unscaled());
+  EXPECT_FALSE(image_skia.GetRepresentation(2.0f).unscaled());
+}
+
 }  // namespace gfx