Make GrCaps and GrShaderCaps private.

Moves getCaps() from GrContext to GrContextPriv and removes unused refCaps().

Change-Id: Ic6a8951b656c0d1b2773eae73bff8e88af819866
Reviewed-on: https://skia-review.googlesource.com/127389
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Greg Daniel <egdaniel@google.com>
diff --git a/dm/DMSrcSink.cpp b/dm/DMSrcSink.cpp
index 5c8ab96..2936493 100644
--- a/dm/DMSrcSink.cpp
+++ b/dm/DMSrcSink.cpp
@@ -1497,7 +1497,7 @@
     sk_sp<SkSurface> surface;
 #if SK_SUPPORT_GPU
     GrContext* context = factory.getContextInfo(fContextType, fContextOverrides).grContext();
-    const int maxDimension = context->caps()->maxTextureSize();
+    const int maxDimension = context->contextPriv().caps()->maxTextureSize();
     if (maxDimension < SkTMax(size.width(), size.height())) {
         return Error::Nonfatal("Src too large to create a texture.\n");
     }