Disable CopyTextureCHROMIUM gl_tests for RGB5_A1 format

gpu/command_buffer/tests/gl_copy_texture_CHROMIUM_unittest.cc

Index: gpu/command_buffer/tests/gl_copy_texture_CHROMIUM_unittest.cc
diff --git a/gpu/command_buffer/tests/gl_copy_texture_CHROMIUM_unittest.cc b/gpu/command_buffer/tests/gl_copy_texture_CHROMIUM_unittest.cc
index 5d6ace6b587fa862c3261f10c529b59e7b7dd782..1c005eba69dfdc604697660e8cc1a057288125a3 100644
--- a/gpu/command_buffer/tests/gl_copy_texture_CHROMIUM_unittest.cc
+++ b/gpu/command_buffer/tests/gl_copy_texture_CHROMIUM_unittest.cc
@@ -295,6 +295,12 @@ class GLCopyTextureCHROMIUMES3Test : public GLCopyTextureCHROMIUMTest {
     DCHECK(!ShouldSkipTest());
     return !gl_.decoder()->GetFeatureInfo()->feature_flags().ext_srgb;
   }
+
+  // RGB5_A1 is not color-renderable on NVIDIA Mac, see crbug.com/676209.
+  bool ShouldSkipRGB5_A1() const {
+    DCHECK(!ShouldSkipTest());
+    return true;
+  }
 };
 
 INSTANTIATE_TEST_CASE_P(CopyType,
@@ -425,6 +431,8 @@ TEST_P(GLCopyTextureCHROMIUMES3Test, FormatCombinations) {
            dest_format_type.internal_format == GL_SRGB_ALPHA_EXT) &&
           ShouldSkipSRGBEXT())
         continue;
+      if (dest_format_type.internal_format == GL_RGB5_A1 && ShouldSkipRGB5_A1())
+        continue;
 
       const GLsizei kWidth = 8, kHeight = 8;
       const int src_channel_count = gles2::GLES2Util::ElementsPerGroup(