Update bench pictures to time image decode & upload costs

src/gpu/GrTest.cpp

Index: src/gpu/GrTest.cpp
===================================================================
--- src/gpu/GrTest.cpp	(revision 12709)
+++ src/gpu/GrTest.cpp	(working copy)
@@ -9,6 +9,7 @@
 #include "GrTest.h"
 
 #include "GrGpu.h"
+#include "GrResourceCache.h"
 
 void GrTestTarget::init(GrContext* ctx, GrDrawTarget* target) {
     SkASSERT(!fContext);
@@ -35,3 +36,7 @@
 void GrContext::setMaxTextureSizeOverride(int maxTextureSizeOverride) {
     fMaxTextureSizeOverride = maxTextureSizeOverride;
 }
+
+void GrContext::purgeAllUnlockedResources() {
+    fTextureCache->purgeAllUnlocked();
+}