Addressed Windows compiler complaints

http://codereview.appspot.com/6462062/

This CL will require re-baselining of the imagemagnifier GM



git-svn-id: http://skia.googlecode.com/svn/trunk@5108 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/gpu/GrClipMaskManager.h b/src/gpu/GrClipMaskManager.h
index fed4205..1187a08 100644
--- a/src/gpu/GrClipMaskManager.h
+++ b/src/gpu/GrClipMaskManager.h
@@ -264,8 +264,8 @@
 public:
     GR_DECLARE_RESOURCE_CACHE_DOMAIN(GetAlphaMaskDomain)
 
-    GrClipMaskManager(GrGpu* gpu)
-        : fGpu(gpu)
+    GrClipMaskManager()
+        : fGpu(NULL)
         , fCurrClipMaskType(kNone_ClipMaskType) {
     }
 
@@ -299,6 +299,10 @@
         return fAACache.getContext();
     }
 
+    void setGpu(GrGpu* gpu) { 
+        fGpu = gpu;
+    }
+
 private:
     /**
      * Informs the helper function adjustStencilParams() about how the stencil