Support GL_OES_EGL_image_external

gpu/command_buffer/build_gles2_cmd_buffer.py

Index: gpu/command_buffer/build_gles2_cmd_buffer.py
diff --git a/gpu/command_buffer/build_gles2_cmd_buffer.py b/gpu/command_buffer/build_gles2_cmd_buffer.py
index 76f3c59b109f83768925f693869b2a87f8b2d803..1158825a49cf3558abf845f4ab990bc8a24ad87c 100755
--- a/gpu/command_buffer/build_gles2_cmd_buffer.py
+++ b/gpu/command_buffer/build_gles2_cmd_buffer.py
@@ -130,8 +130,8 @@ GL_APICALL void         GL_APIENTRY glGetShaderInfoLog (GLidShader shader, GLsiz
 GL_APICALL void         GL_APIENTRY glGetShaderPrecisionFormat (GLenumShaderType shadertype, GLenumShaderPrecision precisiontype, GLint* range, GLint* precision);
 GL_APICALL void         GL_APIENTRY glGetShaderSource (GLidShader shader, GLsizeiNotNegative bufsize, GLsizei* length, char* source);
 GL_APICALL const GLubyte* GL_APIENTRY glGetString (GLenumStringType name);
-GL_APICALL void         GL_APIENTRY glGetTexParameterfv (GLenumTextureTarget target, GLenumTextureParameter pname, GLfloat* params);
-GL_APICALL void         GL_APIENTRY glGetTexParameteriv (GLenumTextureTarget target, GLenumTextureParameter pname, GLint* params);
+GL_APICALL void         GL_APIENTRY glGetTexParameterfv (GLenumGetTexParamTarget target, GLenumTextureParameter pname, GLfloat* params);
+GL_APICALL void         GL_APIENTRY glGetTexParameteriv (GLenumGetTexParamTarget target, GLenumTextureParameter pname, GLint* params);
 GL_APICALL void         GL_APIENTRY glGetUniformfv (GLidProgram program, GLint location, GLfloat* params);
 GL_APICALL void         GL_APIENTRY glGetUniformiv (GLidProgram program, GLint location, GLint* params);
 GL_APICALL GLint        GL_APIENTRY glGetUniformLocation (GLidProgram program, const char* name);
@@ -578,6 +578,21 @@ _ENUM_LISTS = {
       'GL_FOG_HINT',
     ],
   },
+  'GetTexParamTarget': {
+    'type': 'GLenum',
+    'valid': [
+      'GL_TEXTURE_2D',
+      'GL_TEXTURE_CUBE_MAP_POSITIVE_X',
+      'GL_TEXTURE_CUBE_MAP_NEGATIVE_X',
+      'GL_TEXTURE_CUBE_MAP_POSITIVE_Y',
+      'GL_TEXTURE_CUBE_MAP_NEGATIVE_Y',
+      'GL_TEXTURE_CUBE_MAP_POSITIVE_Z',
+      'GL_TEXTURE_CUBE_MAP_NEGATIVE_Z',
+    ],
+    'invalid': [
+      'GL_PROXY_TEXTURE_CUBE_MAP',
+    ]
+  },
   'TextureTarget': {
     'type': 'GLenum',
     'valid': [