Make GrContext::freeGpuResources() purge the resource cache

src/gpu/GrContext.cpp

Index: src/gpu/GrContext.cpp
diff --git a/src/gpu/GrContext.cpp b/src/gpu/GrContext.cpp
index 04e3f8fa9ff16aee0b03f47eaf8b1393a3512ae9..2dba56c391b50bb8bd3482ca904ca4262e7450ec 100755
--- a/src/gpu/GrContext.cpp
+++ b/src/gpu/GrContext.cpp
@@ -215,6 +215,8 @@ void GrContext::freeGpuResources() {
     // a path renderer may be holding onto resources
     SkSafeSetNull(fPathRendererChain);
     SkSafeSetNull(fSoftwarePathRenderer);
+
+    fResourceCache->purgeAllUnlocked();
 }
 
 void GrContext::getResourceCacheUsage(int* resourceCount, size_t* resourceBytes) const {