make the filter mode for GrTextureAccess an enum so we can plumb down
the paint's filter modes to the GPU

BUG=
R=bsalomon@google.com

Review URL: https://codereview.chromium.org/20362002

git-svn-id: http://skia.googlecode.com/svn/trunk@10368 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/include/gpu/GrContext.h b/include/gpu/GrContext.h
index 90382fd..e955cac 100644
--- a/include/gpu/GrContext.h
+++ b/include/gpu/GrContext.h
@@ -901,7 +901,7 @@
                                     const GrCacheID& cacheID,
                                     void* srcData,
                                     size_t rowBytes,
-                                    bool needsFiltering);
+                                    bool filter);
 
     // Needed so GrTexture's returnToCache helper function can call
     // addExistingTextureToCache