cc: Do the math for a tile's content rect in layer space once.

cc/playback/raster_source.h

 // Copyright 2014 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_RASTER_SOURCE_H_
 #define CC_PLAYBACK_RASTER_SOURCE_H_
 
 #include <vector>
 
 #include "base/memory/ref_counted.h"
@@ skipping 53 matching lines @@
   virtual bool IsSolidColor() const = 0;
 
   // Returns the color of the raster source if it is solid color. The results
   // are unspecified if IsSolidColor returns false.
   virtual SkColor GetSolidColor() const = 0;
 
   // Returns the size of this raster source.
   virtual gfx::Size GetSize() const = 0;
 
   // Populate the given list with all SkPixelRefs that may overlap the given
-  // rect at given scale.
+  // rect in layer space.
   virtual void GatherPixelRefs(
-      const gfx::Rect& content_rect,
-      float contents_scale,
+      const gfx::Rect& layer_rect,
       std::vector<skia::PositionPixelRef>* pixel_refs) const = 0;
 
-  // Return true iff this raster source can raster the given rect at given
-  // scale.
-  virtual bool CoversRect(const gfx::Rect& content_rect,
-                          float contents_scale) const = 0;
+  // Return true iff this raster source can raster the given rect in layer
+  // space.
+  virtual bool CoversRect(const gfx::Rect& layer_rect) const = 0;
 
   // Returns true if this raster source has anything to rasterize.
   virtual bool HasRecordings() const = 0;
 
   // Informs the raster source that it should attempt to use distance field text
   // during rasterization.
   virtual void SetShouldAttemptToUseDistanceFieldText() = 0;
 
   // Return true iff this raster source would benefit from using distance
   // field text.
@@ skipping 16 matching lines @@
   RasterSource() {}
   virtual ~RasterSource() {}
 
  private:
   DISALLOW_COPY_AND_ASSIGN(RasterSource);
 };
 
 }  // namespace cc
 
 #endif  // CC_PLAYBACK_RASTER_SOURCE_H_