cleanup GrContext resource cache api

samplecode/SampleApp.cpp

Index: samplecode/SampleApp.cpp
diff --git a/samplecode/SampleApp.cpp b/samplecode/SampleApp.cpp
index 71fb8d3bfd6d9b1e74868ecd58a5414333b5152b..8003a0668f8c5f71e923b9468e895203f751134e 100644
--- a/samplecode/SampleApp.cpp
+++ b/samplecode/SampleApp.cpp
@@ -1863,10 +1863,10 @@ bool SampleWindow::onHandleChar(SkUnichar uni) {
             {
                 GrContext* grContext = this->getGrContext();
                 if (grContext) {
-                    size_t cacheBytes = grContext->getGpuTextureCacheBytes();
+                    size_t cacheBytes;
+                    grContext->getResourceCacheUsage(NULL, &cacheBytes);
                     grContext->freeGpuResources();
-                    SkDebugf("Purged %d bytes from the GPU resource cache.\n",
-                             cacheBytes);
+                    SkDebugf("Purged %d bytes from the GPU resource cache.\n", cacheBytes);
                 }
             }
             return true;