Don't enable CHROMIUM_ycbcr_420v_image when using mesa.

gpu/command_buffer/service/feature_info.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "gpu/command_buffer/service/feature_info.h"
 
 #include <stddef.h>
 
 #include <set>
 #include <vector>
@@ skipping 985 matching lines @@
     // Rectangle textures are used as samplers via glBindTexture, framebuffer
     // textures via glFramebufferTexture2D, and copy destinations via
     // glCopyPixels.
     validators_.texture_bind_target.AddValue(GL_TEXTURE_RECTANGLE_ARB);
     validators_.texture_target.AddValue(GL_TEXTURE_RECTANGLE_ARB);
     validators_.get_tex_param_target.AddValue(GL_TEXTURE_RECTANGLE_ARB);
     validators_.g_l_state.AddValue(GL_TEXTURE_BINDING_RECTANGLE_ARB);
   }
 
 #if defined(OS_MACOSX)
-  AddExtensionString("GL_CHROMIUM_iosurface");
-  AddExtensionString("GL_CHROMIUM_ycbcr_420v_image");
-  feature_flags_.chromium_image_ycbcr_420v = true;
+  if (gfx::GetGLImplementation() != gfx::kGLImplementationOSMesaGL) {
+    AddExtensionString("GL_CHROMIUM_iosurface");
+    AddExtensionString("GL_CHROMIUM_ycbcr_420v_image");
+    feature_flags_.chromium_image_ycbcr_420v = true;
+  }
 #endif
 
   if (extensions.Contains("GL_APPLE_ycbcr_422")) {
     AddExtensionString("GL_CHROMIUM_ycbcr_422_image");
     feature_flags_.chromium_image_ycbcr_422 = true;
   }
 
   // TODO(gman): Add support for these extensions.
   //     GL_OES_depth32
 
@@ skipping 408 matching lines @@
   if (pos == std::string::npos) {
     extensions_ += (extensions_.empty() ? "" : " ") + str;
   }
 }
 
 FeatureInfo::~FeatureInfo() {
 }
 
 }  // namespace gles2
 }  // namespace gpu