Update from https://crrev.com/320931

gpu/command_buffer/cmd_buffer_functions.txt

 // 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 read by build_gles2_cmd_buffer.py to generate commands.
 
 GL_APICALL void         GL_APIENTRY glActiveTexture (GLenum texture);
 GL_APICALL void         GL_APIENTRY glAttachShader (GLidProgram program, GLidShader shader);
 GL_APICALL void         GL_APIENTRY glBindAttribLocation (GLidProgram program, GLuint index, const char* name);
 GL_APICALL void         GL_APIENTRY glBindBuffer (GLenumBufferTarget target, GLidBindBuffer buffer);
@@ skipping 115 matching lines @@
 GL_APICALL GLboolean    GL_APIENTRY glIsShader (GLidShader shader);
 GL_APICALL GLboolean    GL_APIENTRY glIsSync (GLidSync sync);
 GL_APICALL GLboolean    GL_APIENTRY glIsTexture (GLidTexture texture);
 GL_APICALL GLboolean    GL_APIENTRY glIsTransformFeedback (GLidTransformFeedback transformfeedback);
 GL_APICALL void         GL_APIENTRY glLineWidth (GLfloat width);
 GL_APICALL void         GL_APIENTRY glLinkProgram (GLidProgram program);
 GL_APICALL void         GL_APIENTRY glPauseTransformFeedback (void);
 GL_APICALL void         GL_APIENTRY glPixelStorei (GLenumPixelStore pname, GLintPixelStoreAlignment param);
 GL_APICALL void         GL_APIENTRY glPolygonOffset (GLfloat factor, GLfloat units);
 GL_APICALL void         GL_APIENTRY glReadBuffer (GLenum src);
-GL_APICALL void         GL_APIENTRY glReadPixels (GLint x, GLint y, GLsizei width, GLsizei height, GLenumReadPixelFormat format, GLenumPixelType type, void* pixels);
+GL_APICALL void         GL_APIENTRY glReadPixels (GLint x, GLint y, GLsizei width, GLsizei height, GLenumReadPixelFormat format, GLenumReadPixelType type, void* pixels);
 GL_APICALL void         GL_APIENTRY glReleaseShaderCompiler (void);
 GL_APICALL void         GL_APIENTRY glRenderbufferStorage (GLenumRenderBufferTarget target, GLenumRenderBufferFormat internalformat, GLsizei width, GLsizei height);
 GL_APICALL void         GL_APIENTRY glResumeTransformFeedback (void);
 GL_APICALL void         GL_APIENTRY glSampleCoverage (GLclampf value, GLboolean invert);
 GL_APICALL void         GL_APIENTRY glSamplerParameterf (GLidBindSampler sampler, GLenumSamplerParameter pname, GLfloat param);
 GL_APICALL void         GL_APIENTRY glSamplerParameterfv (GLidBindSampler sampler, GLenumSamplerParameter pname, const GLfloat* params);
 GL_APICALL void         GL_APIENTRY glSamplerParameteri (GLidBindSampler sampler, GLenumSamplerParameter pname, GLint param);
 GL_APICALL void         GL_APIENTRY glSamplerParameteriv (GLidBindSampler sampler, GLenumSamplerParameter pname, const GLint* params);
 GL_APICALL void         GL_APIENTRY glScissor (GLint x, GLint y, GLsizei width, GLsizei height);
 GL_APICALL void         GL_APIENTRY glShaderBinary (GLsizeiNotNegative n, const GLuint* shaders, GLenumShaderBinaryFormat binaryformat, const void* binary, GLsizeiNotNegative length);
@@ skipping 153 matching lines @@
 GL_APICALL void         GL_APIENTRY glDiscardBackbufferCHROMIUM (void);
 GL_APICALL void         GL_APIENTRY glScheduleOverlayPlaneCHROMIUM (GLint plane_z_order, GLenum plane_transform, GLuint overlay_texture_id, GLint bounds_x, GLint bounds_y, GLint bounds_width, GLint bounds_height, GLfloat uv_x, GLfloat uv_y, GLfloat uv_width, GLfloat uv_height);
 GL_APICALL void         GL_APIENTRY glSwapInterval (GLint interval);
 
 // Extension CHROMIUM_path_rendering.
 GL_APICALL void         GL_APIENTRY glMatrixLoadfCHROMIUM (GLenumMatrixMode matrixMode, const GLfloat* m);
 GL_APICALL void         GL_APIENTRY glMatrixLoadIdentityCHROMIUM (GLenumMatrixMode matrixMode);
 
 // Extension KHR_blend_equation_advanced
 GL_APICALL void GL_APIENTRY glBlendBarrierKHR (void);