command_buffer: Add support for creating non-WebGL ES 3 contexts

gpu/command_buffer/common/gles2_cmd_utils.h

 // 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.
 
 #ifndef GPU_COMMAND_BUFFER_COMMON_GLES2_CMD_UTILS_H_
 #define GPU_COMMAND_BUFFER_COMMON_GLES2_CMD_UTILS_H_
 
@@ skipping 195 matching lines @@
 
   static const EnumToString* const enum_to_string_table_;
   static const size_t enum_to_string_table_len_;
 
   int num_compressed_texture_formats_;
   int num_shader_binary_formats_;
 };
 
 struct GLES2_UTILS_EXPORT ContextCreationAttribHelper {
   ContextCreationAttribHelper();
+  enum ContextType {

[Zhenyao Mo, 2015/08/28 17:16:25]

Can we move this outside ContextCreationAttribHelper, so we can reference it as
gpu::gles2::ContextType, and use it everywhere instead of multiple enum
definition?

[Kimmo Kinnunen, 2015/08/31 12:23:13]

Done.

+    CONTEXT_TYPE_WEBGL1,
+    CONTEXT_TYPE_WEBGL2,
+    CONTEXT_TYPE_OPENGLES2,
+    CONTEXT_TYPE_OPENGLES3
+  };
 
   void Serialize(std::vector<int32_t>* attribs) const;
   bool Parse(const std::vector<int32_t>& attribs);
 
   // -1 if invalid or unspecified.
   int32_t alpha_size;
   int32_t blue_size;
   int32_t green_size;
   int32_t red_size;
   int32_t depth_size;
   int32_t stencil_size;
   int32_t samples;
   int32_t sample_buffers;
   bool buffer_preserved;
   bool bind_generates_resource;
   bool fail_if_major_perf_caveat;
   bool lose_context_when_out_of_memory;
-  // 0 if not a WebGL context.
-  unsigned webgl_version;
+  ContextType context_type;
 };
 
 }  // namespace gles2
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_COMMON_GLES2_CMD_UTILS_H_