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

gpu/command_buffer/common/gles2_cmd_utils.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.
 
 // This file is here so other GLES2 related files can have a common set of
 // includes where appropriate.
 
 #include "gpu/command_buffer/common/gles2_cmd_utils.h"
 
 #include <GLES2/gl2.h>
@@ skipping 1860 matching lines @@
       return true;
     case CONTEXT_TYPE_OPENGLES2:
     case CONTEXT_TYPE_OPENGLES3:
       return false;
   }
 
   NOTREACHED();
   return false;
 }
 
+bool IsWebGL1OrES2ContextType(ContextType context_type) {
+  // 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;
+}
+
+bool IsWebGL2OrES3ContextType(ContextType context_type) {
+  // Switch statement to cause a compile-time error if we miss a case.
+  switch (context_type) {
+    case CONTEXT_TYPE_OPENGLES3:
+    case CONTEXT_TYPE_WEBGL2:
+      return true;
+    case CONTEXT_TYPE_WEBGL1:
+    case CONTEXT_TYPE_OPENGLES2:
+      return false;
+  }
+
+  NOTREACHED();
+  return false;
+}
+
 ContextCreationAttribHelper::ContextCreationAttribHelper()
     : gpu_preference(gl::PreferIntegratedGpu),
       alpha_size(-1),
       blue_size(-1),
       green_size(-1),
       red_size(-1),
       depth_size(-1),
       stencil_size(-1),
       samples(-1),
       sample_buffers(-1),
@@ skipping 73 matching lines @@
     }
   }
 
   return true;
 }
 
 #include "gpu/command_buffer/common/gles2_cmd_utils_implementation_autogen.h"
 
 }  // namespace gles2
 }  // namespace gpu