Add display-resolution caching to GPU IDC

cc/playback/draw_image.h

 // Copyright 2015 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.
 
 #ifndef CC_PLAYBACK_DRAW_IMAGE_H_
 #define CC_PLAYBACK_DRAW_IMAGE_H_
 
 #include "cc/base/cc_export.h"
 #include "third_party/skia/include/core/SkFilterQuality.h"
 #include "third_party/skia/include/core/SkImage.h"
@@ skipping 16 matching lines @@
   ~DrawImage();
 
   const sk_sp<const SkImage>& image() const { return image_; }
   const SkSize& scale() const { return scale_; }
   const SkIRect src_rect() const { return src_rect_; }
   SkFilterQuality filter_quality() const { return filter_quality_; }
   bool matrix_is_decomposable() const { return matrix_is_decomposable_; }
   const SkMatrix& matrix() const { return matrix_; }
 
   DrawImage ApplyScale(float scale) const {
+    return ApplyScale(SkSize::Make(scale, scale));
+  }
+
+  DrawImage ApplyScale(const SkSize& scale) const {
     SkMatrix scaled_matrix = matrix_;
-    scaled_matrix.postScale(scale, scale);
+    scaled_matrix.postScale(scale.width(), scale.height());
     return DrawImage(image_, src_rect_, filter_quality_, scaled_matrix);
   }
 
  private:
   sk_sp<const SkImage> image_;
   SkIRect src_rect_;
   SkFilterQuality filter_quality_;
   SkMatrix matrix_;
   SkSize scale_;
   bool matrix_is_decomposable_;
 };
 
 }  // namespace cc
 
 #endif  // CC_PLAYBACK_DRAW_IMAGE_H_