Skip the sRGB mip-map testing on command buffer

tests/SRGBMipMapTest.cpp

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "Test.h"
 #if SK_SUPPORT_GPU
 #include "GrCaps.h"
@@ skipping 130 matching lines @@
                           "first render of sRGB");
 
     // 2) Draw texture to L32 surface (should generate/use linear mips)
     paint.setGammaCorrect(false);
     l32RenderTargetContext->drawRect(noClip, paint, SkMatrix::I(), rect);
 
     // Right now, this test only runs on GL (because Vulkan doesn't support legacy mip-mapping
     // skbug.com/5048). On GL, we may not have sRGB decode support. In that case, rendering sRGB
     // textures to a legacy surface produces nonsense, so this part of the test is meaningless.
     //
+    // We also skip this part of the test on command buffer (via srgbDecodeDisableAffectsMipmaps),
+    // because that implementation of the extension doesn't ensure that mips respect the setting.
+    //
     // TODO: Once Vulkan supports legacy mip-mapping, we can promote this to GrCaps. Right now,
     // Vulkan has most of the functionality, but not the mip-mapping part that's being tested here.
     GrGLGpu* glGpu = static_cast<GrGLGpu*>(context->getGpu());
-    if (glGpu->glCaps().srgbDecodeDisableSupport()) {
+    if (glGpu->glCaps().srgbDecodeDisableSupport() &&
+        glGpu->glCaps().srgbDecodeDisableAffectsMipmaps()) {
         read_and_check_pixels(reporter, l32RenderTargetContext->asTexture().get(), expectedLinear,
                               error, "re-render as linear");
     }
 
     // 3) Go back to sRGB
     paint.setGammaCorrect(true);
     s32RenderTargetContext->drawRect(noClip, paint, SkMatrix::I(), rect);
     read_and_check_pixels(reporter, s32RenderTargetContext->asTexture().get(), expectedSRGB, error,
                           "re-render as sRGB");
 }
 #endif