Make some GrSurfaceProxy and GrTextureProxy methods easier to access

Move peek[Surface|Texture|RenderTarget]() from GrSurfaceProxyPriv to
to GrSurfaceProxy.

Move proxyMipMapped(), textureType(), and hasRestrictedSampling()
from GrTextureProxyPriv to GrTextureProxy.

Change-Id: I259114d0508c4613d55f7f1faccac362fa6fb281
Reviewed-on: https://skia-review.googlesource.com/144641
Commit-Queue: Robert Phillips <robertphillips@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
diff --git a/src/gpu/effects/GrRectBlurEffect.cpp b/src/gpu/effects/GrRectBlurEffect.cpp
index 0e99bc0..7b7b658 100644
--- a/src/gpu/effects/GrRectBlurEffect.cpp
+++ b/src/gpu/effects/GrRectBlurEffect.cpp
@@ -114,7 +114,7 @@
         auto sigma = _outer.sigma();
         (void)sigma;
         GrSurfaceProxy& blurProfileProxy = *_outer.textureSampler(0).proxy();
-        GrTexture& blurProfile = *blurProfileProxy.priv().peekTexture();
+        GrTexture& blurProfile = *blurProfileProxy.peekTexture();
         (void)blurProfile;
         UniformHandle& proxyRectHalf = fProxyRectHalfVar;
         (void)proxyRectHalf;