Add a second unsafe ES3 API in command buffer.

gpu/command_buffer/client/gles2_trace_implementation_impl_autogen.h

Index: gpu/command_buffer/client/gles2_trace_implementation_impl_autogen.h
diff --git a/gpu/command_buffer/client/gles2_trace_implementation_impl_autogen.h b/gpu/command_buffer/client/gles2_trace_implementation_impl_autogen.h
index 97f3d1ef0a7ef39b01493291ed52ce4c335f60b4..6d5759e7d02ec5100b24c833c6f8d359cc67c61e 100644
--- a/gpu/command_buffer/client/gles2_trace_implementation_impl_autogen.h
+++ b/gpu/command_buffer/client/gles2_trace_implementation_impl_autogen.h
@@ -167,6 +167,16 @@ void GLES2TraceImplementation::CompressedTexSubImage2D(GLenum target,
                                format, imageSize, data);
 }
 
+void GLES2TraceImplementation::CopyBufferSubData(GLenum readtarget,
+                                                 GLenum writetarget,
+                                                 GLintptr readoffset,
+                                                 GLintptr writeoffset,
+                                                 GLsizeiptr size) {
+  TRACE_EVENT_BINARY_EFFICIENT0("gpu", "GLES2Trace::CopyBufferSubData");
+  gl_->CopyBufferSubData(readtarget, writetarget, readoffset, writeoffset,
+                         size);
+}
+
 void GLES2TraceImplementation::CopyTexImage2D(GLenum target,
                                               GLint level,
                                               GLenum internalformat,