[DevTools] Add stubs for Emulation domain.

content/browser/devtools/protocol/emulation_handler.h

+// 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.
+
+#ifndef CONTENT_BROWSER_DEVTOOLS_PROTOCOL_EMULATION_HANDLER_H_
+#define CONTENT_BROWSER_DEVTOOLS_PROTOCOL_EMULATION_HANDLER_H_
+
+#include "content/browser/devtools/protocol/devtools_protocol_handler.h"
+
+namespace content {
+namespace devtools {
+namespace emulation {
+
+class EmulationHandler {
+ public:
+  using Response = DevToolsProtocolClient::Response;
+
+  EmulationHandler();
+  virtual ~EmulationHandler();
+
+  Response SetGeolocationOverride(double* latitude,
+                                  double* longitude,
+                                  double* accuracy);
+  Response ClearGeolocationOverride();
+
+  Response SetTouchEmulationEnabled(bool enabled,
+                                    const std::string* configuration);
+
+  Response CanEmulate(bool* result);
+  Response 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);
+  Response ClearDeviceMetricsOverride();
+
+  void SetClient(scoped_ptr<DevToolsProtocolClient> client);
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(EmulationHandler);
+};
+
+}  // namespace emulation
+}  // namespace devtools
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_DEVTOOLS_PROTOCOL_EMULATION_HANDLER_H_