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/GrRRectBlurEffect.cpp b/src/gpu/effects/GrRRectBlurEffect.cpp
index 6101f24..e9659f5 100644
--- a/src/gpu/effects/GrRRectBlurEffect.cpp
+++ b/src/gpu/effects/GrRRectBlurEffect.cpp
@@ -108,7 +108,7 @@
         UniformHandle& cornerRadius = fCornerRadiusVar;
         (void)cornerRadius;
         GrSurfaceProxy& ninePatchSamplerProxy = *_outer.textureSampler(0).proxy();
-        GrTexture& ninePatchSampler = *ninePatchSamplerProxy.priv().peekTexture();
+        GrTexture& ninePatchSampler = *ninePatchSamplerProxy.peekTexture();
         (void)ninePatchSampler;
         UniformHandle& proxyRect = fProxyRectVar;
         (void)proxyRect;