Migrate some last instances of GrContext to GrDirectContext

This is a rename with no functional changes.

Change-Id: I4b0b7ee1926b688029e257b35c469113c0404a5b
diff --git a/libs/hwui/renderthread/CacheManager.h b/libs/hwui/renderthread/CacheManager.h
index b009cc4..0a6b8dc 100644
--- a/libs/hwui/renderthread/CacheManager.h
+++ b/libs/hwui/renderthread/CacheManager.h
@@ -18,7 +18,7 @@
 #define CACHEMANAGER_H
 
 #ifdef __ANDROID__ // Layoutlib does not support hardware acceleration
-#include <GrContext.h>
+#include <GrDirectContext.h>
 #endif
 #include <SkSurface.h>
 #include <utils/String8.h>
@@ -58,13 +58,13 @@
     explicit CacheManager();
 
 #ifdef __ANDROID__ // Layoutlib does not support hardware acceleration
-    void reset(sk_sp<GrContext> grContext);
+    void reset(sk_sp<GrDirectContext> grContext);
 #endif
     void destroy();
 
     const size_t mMaxSurfaceArea;
 #ifdef __ANDROID__ // Layoutlib does not support hardware acceleration
-    sk_sp<GrContext> mGrContext;
+    sk_sp<GrDirectContext> mGrContext;
 #endif
 
     const size_t mMaxResourceBytes;