Revert of Remove rt flags that are not necessary

tests/FloatingPointTextureTest.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 /*
  * This is a straightforward test of floating point textures, which are
  * supported on some platforms.  As of right now, this test only supports
@@ skipping 24 matching lines @@
     for (int i = 0; i < arraySize; i += 4) {
         controlPixelData[i + 0] = min;
         controlPixelData[i + 1] = max;
         controlPixelData[i + 2] = epsilon;
         controlPixelData[i + 3] = maxInt;
     }
 
     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;
             desc.fOrigin = 0 == origin ?
             kTopLeft_GrSurfaceOrigin : kBottomLeft_GrSurfaceOrigin;
 
             GrContextFactory::GLContextType type =
                 static_cast<GrContextFactory::GLContextType>(glCtxType);
             if (!GrContextFactory::IsRenderingGLContext(type)) {
                 continue;
@@ skipping 36 matching lines @@
 
 static const int HALF_RGBA_CONTROL_ARRAY_SIZE = DEV_W * DEV_H * 4 /*RGBA*/;
 
 DEF_GPUTEST(HalfFloatRGBATextureTest, reporter, factory) {
     runFPTest<SkHalf>(reporter, factory, SK_HalfMin, SK_HalfMax, SK_HalfEpsilon,
         kMaxIntegerRepresentableInHalfFloatingPoint,
         HALF_RGBA_CONTROL_ARRAY_SIZE, kRGBA_half_GrPixelConfig);
 }
 
 #endif