[3/5] Add translated rasterization support for RasterBuffer & below

cc/raster/raster_buffer.h

Index: cc/raster/raster_buffer.h
diff --git a/cc/raster/raster_buffer.h b/cc/raster/raster_buffer.h
index d045a701f6eaf55bb7c07914400783587d068a81..6412b345cabb38c197cc95cd856c56bc146009e9 100644
--- a/cc/raster/raster_buffer.h
+++ b/cc/raster/raster_buffer.h
@@ -13,6 +13,8 @@
 
 namespace cc {
 
+class ScaleTranslate2d;
+
 class CC_EXPORT RasterBuffer {
  public:
   RasterBuffer();
@@ -23,7 +25,7 @@ class CC_EXPORT RasterBuffer {
       const gfx::Rect& raster_full_rect,
       const gfx::Rect& raster_dirty_rect,
       uint64_t new_content_id,
-      float scale,
+      const ScaleTranslate2d& transform,
       const RasterSource::PlaybackSettings& playback_settings) = 0;
 };