cc: Move RasterBuffer implementations from ResourceProvider to RasterWorkerPool implementations.

cc/resources/raster_buffer.h

Index: cc/resources/raster_buffer.h
diff --git a/cc/resources/raster_buffer.h b/cc/resources/raster_buffer.h
index 2f010853e8d886c7ffcb8d5659180e86ec145702..d148b72dfe5a913e805b46fe27e8f9166ff0420a 100644
--- a/cc/resources/raster_buffer.h
+++ b/cc/resources/raster_buffer.h
@@ -5,19 +5,20 @@
 #ifndef CC_RESOURCES_RASTER_BUFFER_H_
 #define CC_RESOURCES_RASTER_BUFFER_H_
 
+#include "cc/base/cc_export.h"
 #include "skia/ext/refptr.h"
 
 class SkCanvas;
 
 namespace cc {
 
-class RasterBuffer {
+class CC_EXPORT RasterBuffer {
  public:
+  RasterBuffer();
+  virtual ~RasterBuffer();
+
   virtual skia::RefPtr<SkCanvas> AcquireSkCanvas() = 0;
   virtual void ReleaseSkCanvas(const skia::RefPtr<SkCanvas>& canvas) = 0;
-
- protected:
-  virtual ~RasterBuffer() {}
 };
 
 }  // namespace cc