Revert of Remove rt flags that are not necessary

tests/FloatingPointTextureTest.cpp

Index: tests/FloatingPointTextureTest.cpp
diff --git a/tests/FloatingPointTextureTest.cpp b/tests/FloatingPointTextureTest.cpp
index d891b47aa79d0341b2118c01fc17279f394b5439..1adc7442af610f7cc9315eb832e282724ff01fcc 100644
--- a/tests/FloatingPointTextureTest.cpp
+++ b/tests/FloatingPointTextureTest.cpp
@@ -42,6 +42,7 @@
     for (int origin = 0; origin < 2; ++origin) {
         for (int glCtxType = 0; glCtxType < GrContextFactory::kGLContextTypeCnt; ++glCtxType) {
             GrSurfaceDesc desc;
+            desc.fFlags = kRenderTarget_GrSurfaceFlag;
             desc.fWidth = DEV_W;
             desc.fHeight = DEV_H;
             desc.fConfig = config;