Add GR_DLL builds to Ganesh (minimal exports for Chrome multi-dll for now).

Review URL:  http://codereview.appspot.com/4301044/




git-svn-id: http://skia.googlecode.com/svn/trunk@970 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/include/gpu/SkGpuDevice.h b/include/gpu/SkGpuDevice.h
index 8852803..fbe5929 100644
--- a/include/gpu/SkGpuDevice.h
+++ b/include/gpu/SkGpuDevice.h
@@ -30,7 +30,7 @@
  *  Subclass of SkDevice, which directs all drawing to the GrGpu owned by the
  *  canvas.
  */
-class SkGpuDevice : public SkDevice {
+class SK_API SkGpuDevice : public SkDevice {
 public:
     /**
      * The SkGpuDevice will render to the GrRenderTarget, or if the paremeter is