Add CopyTexSubImage3D to GPU command buffer.

gpu/command_buffer/client/gles2_implementation_autogen.h

Index: gpu/command_buffer/client/gles2_implementation_autogen.h
diff --git a/gpu/command_buffer/client/gles2_implementation_autogen.h b/gpu/command_buffer/client/gles2_implementation_autogen.h
index b32dd4458f5d5b08c1768138d652548bbc1b12b7..7d7b0a7fbfbdfd8acf9a25f68041e5b86ff3f468 100644
--- a/gpu/command_buffer/client/gles2_implementation_autogen.h
+++ b/gpu/command_buffer/client/gles2_implementation_autogen.h
@@ -147,6 +147,16 @@ void CopyTexSubImage2D(GLenum target,
                        GLsizei width,
                        GLsizei height) override;
 
+void CopyTexSubImage3D(GLenum target,
+                       GLint level,
+                       GLint xoffset,
+                       GLint yoffset,
+                       GLint zoffset,
+                       GLint x,
+                       GLint y,
+                       GLsizei width,
+                       GLsizei height) override;
+
 GLuint CreateProgram() override;
 
 GLuint CreateShader(GLenum type) override;