content: Move type selection logic out of GpuMemoryBufferImpl.

content/common/gpu/gpu_memory_buffer_factory.h

Index: content/common/gpu/gpu_memory_buffer_factory.h
diff --git a/content/common/gpu/gpu_memory_buffer_factory.h b/content/common/gpu/gpu_memory_buffer_factory.h
index 5dd2203f2680e4bec2d1e945b8fc4e5a6f7fb2fd..f55f838d34683a09e5143beee4ab6d4f68671f5c 100644
--- a/content/common/gpu/gpu_memory_buffer_factory.h
+++ b/content/common/gpu/gpu_memory_buffer_factory.h
@@ -7,6 +7,7 @@
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
+#include "content/common/content_export.h"
 #include "ui/gfx/geometry/size.h"
 #include "ui/gfx/gpu_memory_buffer.h"
 
@@ -20,7 +21,7 @@ class ImageFactory;
 
 namespace content {
 
-class GpuMemoryBufferFactory {
+class CONTENT_EXPORT GpuMemoryBufferFactory {
  public:
   GpuMemoryBufferFactory() {}
   virtual ~GpuMemoryBufferFactory() {}