[DevTools] Introduced WebDeviceEmulationParams.

public/web/WebDeviceEmulationParams.h

+// Copyright 2014 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 WebDeviceEmulationParams_h
+#define WebDeviceEmulationParams_h
+
+#include "public/platform/WebRect.h"
+#include "public/platform/WebSize.h"
+
+namespace blink {
+
+// All sizes are measured in device independent pixels.
+struct WebDeviceEmulationParams {
+    // For mobile, screen has the same size as view, which is positioned at (0;0).
+    // For desktop, screen size and view position are preserved.
+    enum ScreenPosition {
+        Desktop,
+        Mobile
+    };
+
+    ScreenPosition screenPosition;
+
+    // If zero, the original device scale factor is preserved.
+    float deviceScaleFactor;
+
+    // Emulated view size. Empty size means no override.
+    WebSize viewSize;
+
+    // Whether emulated view should be scaled down if necessary to fit into available space.
+    bool fitToView;
+
+    // Insets of emulated view inside available view space, in fit to view mode.
+    WebSize viewInsets;
+
+    WebDeviceEmulationParams()
+        : screenPosition(Desktop)
+        , deviceScaleFactor(0)
+        , fitToView(false) { }
+};
+
+} // namespace blink
+
+#endif