Add glWaitSync to GPU command buffer.

BUG=429053
TEST=gpu_unittests
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Review URL: https://codereview.chromium.org/936183002

Cr-Commit-Position: refs/heads/master@{#316969}
diff --git a/gpu/command_buffer/cmd_buffer_functions.txt b/gpu/command_buffer/cmd_buffer_functions.txt
index 6f768f2..570eff1 100644
--- a/gpu/command_buffer/cmd_buffer_functions.txt
+++ b/gpu/command_buffer/cmd_buffer_functions.txt
@@ -213,6 +213,7 @@
 GL_APICALL void         GL_APIENTRY glVertexAttribIPointer (GLuint indx, GLintVertexAttribSize size, GLenumVertexAttribType type, GLsizei stride, const void* ptr);
 GL_APICALL void         GL_APIENTRY glVertexAttribPointer (GLuint indx, GLintVertexAttribSize size, GLenumVertexAttribType type, GLboolean normalized, GLsizei stride, const void* ptr);
 GL_APICALL void         GL_APIENTRY glViewport (GLint x, GLint y, GLsizei width, GLsizei height);
+GL_APICALL void         GL_APIENTRY glWaitSync (GLsync sync, GLbitfieldSyncFlushFlags flags, GLuint64 timeout);
 GL_APICALL void         GL_APIENTRY glBlitFramebufferCHROMIUM (GLint srcX0, GLint srcY0, GLint srcX1, GLint srcY1, GLint dstX0, GLint dstY0, GLint dstX1, GLint dstY1, GLbitfield mask, GLenumBlitFilter filter);
 GL_APICALL void         GL_APIENTRY glRenderbufferStorageMultisampleCHROMIUM (GLenumRenderBufferTarget target, GLsizei samples, GLenumRenderBufferFormat internalformat, GLsizei width, GLsizei height);
 GL_APICALL void         GL_APIENTRY glRenderbufferStorageMultisampleEXT (GLenumRenderBufferTarget target, GLsizei samples, GLenumRenderBufferFormat internalformat, GLsizei width, GLsizei height);