Don't use a global share group for the passthrough command buffer contexts.

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 1478 matching lines @@
     validators_.texture_parameter.AddValue(GL_TEXTURE_SWIZZLE_B);
     validators_.texture_parameter.AddValue(GL_TEXTURE_SWIZZLE_A);
   }
 }
 
 bool FeatureInfo::IsWebGLContext() const {
   return IsWebGLContextType(context_type_);
 }
 
 bool FeatureInfo::IsWebGL1OrES2Context() const {
-  // Switch statement to cause a compile-time error if we miss a case.
-  switch (context_type_) {
-    case CONTEXT_TYPE_WEBGL1:
-    case CONTEXT_TYPE_OPENGLES2:
-      return true;
-    case CONTEXT_TYPE_WEBGL2:
-    case CONTEXT_TYPE_OPENGLES3:
-      return false;
-  }
-
-  NOTREACHED();
-  return false;
+  return IsWebGL1OrES2ContextType(context_type_);
 }
 
 bool FeatureInfo::IsWebGL2OrES3Context() const {
-  // Switch statement to cause a compile-time error if we miss a case.
-  switch (context_type_) {
-    case CONTEXT_TYPE_WEBGL2:
-    case CONTEXT_TYPE_OPENGLES3:
-      return true;
-    case CONTEXT_TYPE_WEBGL1:
-    case CONTEXT_TYPE_OPENGLES2:
-      return false;
-  }
-
-  NOTREACHED();
-  return false;
+  return IsWebGL2OrES3ContextType(context_type_);
 }
 
 void FeatureInfo::AddExtensionString(const char* s) {
   std::string str(s);
   size_t pos = extensions_.find(str);
   while (pos != std::string::npos &&
          pos + str.length() < extensions_.length() &&
          extensions_.substr(pos + str.length(), 1) != " ") {
     // This extension name is a substring of another.
     pos = extensions_.find(str, pos + str.length());
   }
   if (pos == std::string::npos) {
     extensions_ += (extensions_.empty() ? "" : " ") + str;
   }
 }
 
 FeatureInfo::~FeatureInfo() {
 }
 
 }  // namespace gles2
 }  // namespace gpu