[DevTools] Add stubs for Emulation domain.

content/browser/devtools/protocol/emulation_handler.cc

+// Copyright 2015 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.
+
+#include "content/browser/devtools/protocol/emulation_handler.h"
+
+namespace content {
+namespace devtools {
+namespace emulation {
+
+using Response = DevToolsProtocolClient::Response;
+
+EmulationHandler::EmulationHandler() {
+}
+
+EmulationHandler::~EmulationHandler() {
+}
+
+void EmulationHandler::SetClient(scoped_ptr<DevToolsProtocolClient> client) {
+}
+
+Response EmulationHandler::SetGeolocationOverride(
+    double* latitude, double* longitude, double* accuracy) {
+  return Response::InternalError("Not implemented");
+}
+
+Response EmulationHandler::ClearGeolocationOverride() {
+  return Response::InternalError("Not implemented");
+}
+
+Response EmulationHandler::SetTouchEmulationEnabled(
+    bool enabled, const std::string* configuration) {
+  return Response::InternalError("Not implemented");
+}
+
+Response EmulationHandler::CanEmulate(bool* result) {
+  return Response::InternalError("Not implemented");
+}
+
+Response EmulationHandler::SetDeviceMetricsOverride(
+    int width, int height, double device_scale_factor, bool mobile,
+    bool fit_window, const double* optional_scale,
+    const double* optional_offset_x, const double* optional_offset_y) {
+  return Response::InternalError("Not implemented");
+}
+
+Response EmulationHandler::ClearDeviceMetricsOverride() {
+  return Response::InternalError("Not implemented");
+}
+
+}  // namespace emulation
+}  // namespace devtools
+}  // namespace content