Don't enable occlusion query on Linux with Intel drivers.

gpu/command_buffer/service/gles2_cmd_decoder.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/gles2_cmd_decoder.h"
 
 #include <stdio.h>
 
 #include <algorithm>
 #include <list>
@@ skipping 2218 matching lines @@
   // variable in fragment shaders.
   if (gfx::GetGLImplementation() != gfx::kGLImplementationEGLGLES2) {
     glEnable(GL_VERTEX_PROGRAM_POINT_SIZE);
     glEnable(GL_POINT_SPRITE);
   }
 
   has_arb_robustness_ = context->HasExtension("GL_ARB_robustness");
 
   if (!disable_workarounds_) {
 #if defined(OS_MACOSX)
-    const char* vendor_str = reinterpret_cast<const char*>(
-        glGetString(GL_VENDOR));
     needs_mac_nvidia_driver_workaround_ =
-        vendor_str && strstr(vendor_str, "NVIDIA");
+        feature_info_->feature_flags().is_nvidia;
     needs_glsl_built_in_function_emulation_ =
-        vendor_str && (strstr(vendor_str, "ATI") || strstr(vendor_str, "AMD"));
+        feature_info_->feature_flags().is_amd;
 #endif
   }
 
   if (!InitializeShaderTranslator()) {
     return false;
   }
 
   viewport_width_ = size.width();
   viewport_height_ = size.height();
   glViewport(viewport_x_, viewport_y_, viewport_width_, viewport_height_);
@@ skipping 6473 matching lines @@
   BindAndApplyTextureParameters(info);
 }
 
 // Include the auto-generated part of this file. We split this because it means
 // we can easily edit the non-auto generated parts right here in this file
 // instead of having to edit some template or the code generator.
 #include "gpu/command_buffer/service/gles2_cmd_decoder_autogen.h"
 
 }  // namespace gles2
 }  // namespace gpu