Workaround for Intel 6xxx clear to 0/1 bug

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>
 
 #include "base/command_line.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_split.h"
 #include "gpu/command_buffer/service/gpu_switches.h"
 #include "gpu/command_buffer/service/texture_definition.h"
 #include "gpu/config/gpu_switches.h"
 #include "ui/gl/gl_bindings.h"
+#include "ui/gl/gl_context.h"
 #include "ui/gl/gl_fence.h"
 #include "ui/gl/gl_implementation.h"
 #include "ui/gl/gl_switches.h"
 #include "ui/gl/gl_version_info.h"
 
 #if !defined(OS_MACOSX)
 #include "ui/gl/gl_fence_egl.h"
 #endif
 
 namespace gpu {
@@ skipping 520 matching lines @@
 
   // Check if we should enable GL_EXT_texture_filter_anisotropic.
   if (extensions.Contains("GL_EXT_texture_filter_anisotropic")) {
     AddExtensionString("GL_EXT_texture_filter_anisotropic");
     validators_.texture_parameter.AddValue(
         GL_TEXTURE_MAX_ANISOTROPY_EXT);
     validators_.g_l_state.AddValue(
         GL_MAX_TEXTURE_MAX_ANISOTROPY_EXT);
   }
 
+  // Pass some workarounds to ui/gl so that we can apply it in gl api.
+  gl::GLWorkarounds glWorkarounds;

[Zhenyao Mo, 2017/06/20 21:34:17]

gl_workarounds

[jiajia.qin, 2017/06/21 02:47:22]

Done.

+  if (workarounds_.clear_to_boundary_values_is_broken) {
+    glWorkarounds.clearToBoundaryValuesIsBroken = true;
+  }
+  gl::SetGLWorkarounds(glWorkarounds);
+
   // Check if we should support GL_OES_packed_depth_stencil and/or
   // GL_GOOGLE_depth_texture / GL_CHROMIUM_depth_texture.
   //
   // NOTE: GL_OES_depth_texture requires support for depth cubemaps.
   // GL_ARB_depth_texture requires other features that
   // GL_OES_packed_depth_stencil does not provide.
   //
   // Therefore we made up GL_GOOGLE_depth_texture / GL_CHROMIUM_depth_texture.
   //
   // GL_GOOGLE_depth_texture is legacy. As we exposed it into NaCl we can't
@@ skipping 1170 matching lines @@
   if (pos == std::string::npos) {
     extensions_ += (extensions_.empty() ? "" : " ") + str;
   }
 }
 
 FeatureInfo::~FeatureInfo() {
 }
 
 }  // namespace gles2
 }  // namespace gpu