Support GL_OES_EGL_image_external

gpu/command_buffer/service/gl_utils.h

 // Copyright (c) 2011 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 includes all the necessary GL headers and implements some useful
 // utilities.
 
 #ifndef GPU_COMMAND_BUFFER_SERVICE_GL_UTILS_H_
 #define GPU_COMMAND_BUFFER_SERVICE_GL_UTILS_H_
 
@@ skipping 14 matching lines @@
 #define GL_MAX_VERTEX_UNIFORM_VECTORS       0x8DFB
 #define GL_MAX_VARYING_VECTORS              0x8DFC
 #define GL_SHADER_BINARY_FORMATS          0x8DF8
 #define GL_NUM_SHADER_BINARY_FORMATS      0x8DF9
 #define GL_SHADER_COMPILER                0x8DFA
 #define GL_RGB565                         0x8D62
 #define GL_FRAGMENT_SHADER_DERIVATIVE_HINT_OES 0x8B8B
 #define GL_RGB8_OES                            0x8051
 #define GL_RGBA8_OES                           0x8058
 
+// GL_OES_EGL_image_external
+#define GL_TEXTURE_EXTERNAL_OES                0x8D65
+#define GL_SAMPLER_EXTERNAL_OES                0x8D66
+#define GL_TEXTURE_BINDING_EXTERNAL_OES        0x8D67
+#define GL_REQUIRED_TEXTURE_IMAGE_UNITS_OES    0x8D68
+
 #define GL_GLEXT_PROTOTYPES 1
 
 // Define this for extra GL error debugging (slower).
 // #define GL_ERROR_DEBUGGING
 #ifdef GL_ERROR_DEBUGGING
 #define CHECK_GL_ERROR() do {                                           \
     GLenum gl_error = glGetError();                                     \
     LOG_IF(ERROR, gl_error != GL_NO_ERROR) << "GL Error :" << gl_error; \
   } while (0)
 #else  // GL_ERROR_DEBUGGING
 #define CHECK_GL_ERROR() void(0)
 #endif  // GL_ERROR_DEBUGGING
 
 #endif  // GPU_COMMAND_BUFFER_SERVICE_GL_UTILS_H_