Move internal calls from GrContext to GrContextPriv

A mechanical bulk move just to get these out of the public API.

TBR=bsalomon@google.com
Change-Id: I813efbd54a09dd448275697c0e50947753a5cfd3
Reviewed-on: https://skia-review.googlesource.com/112262
Commit-Queue: Robert Phillips <robertphillips@google.com>
Reviewed-by: Greg Daniel <egdaniel@google.com>
diff --git a/tests/GrSurfaceTest.cpp b/tests/GrSurfaceTest.cpp
index daef511..18c0275 100644
--- a/tests/GrSurfaceTest.cpp
+++ b/tests/GrSurfaceTest.cpp
@@ -197,7 +197,7 @@
                             texCtx->writePixels(info, data.get(), 0, 0, 0);
                         }
                     }
-                    context->purgeAllUnlockedResources();
+                    context->contextPriv().purgeAllUnlockedResources_ForTesting();
 
                     // Try creating the texture as a deferred proxy.
                     for (int i = 0; i < 2; ++i) {
@@ -224,7 +224,7 @@
                             surfCtx->writePixels(info, data.get(), 0, 0, 0);
                         }
                     }
-                    context->purgeAllUnlockedResources();
+                    context->contextPriv().purgeAllUnlockedResources_ForTesting();
                 }
             }
         }