Make GrResourceCache dynamically change between LRU and random replacement strategies.

src/gpu/GrDrawingManager.h

Index: src/gpu/GrDrawingManager.h
diff --git a/src/gpu/GrDrawingManager.h b/src/gpu/GrDrawingManager.h
index 56e46ef53dfdb446df4218fc12d131d78f2fd0cb..bdbef91c28a7675bc3143dbe57c92e325ea502cf 100644
--- a/src/gpu/GrDrawingManager.h
+++ b/src/gpu/GrDrawingManager.h
@@ -74,6 +74,7 @@ private:
         , fSoftwarePathRenderer(nullptr)
         , fFlushState(context->getGpu(), context->resourceProvider())
         , fFlushing(false)
+        , fLastFlushType(GrResourceCache::FlushType::kExternal)
         , fIsImmediateMode(isImmediateMode) {
     }
 
@@ -104,6 +105,7 @@ private:
 
     GrBatchFlushState                 fFlushState;
     bool                              fFlushing;
+    GrResourceCache::FlushType        fLastFlushType;
 
     bool                              fIsImmediateMode;
 };