[DevTools] Add offset and scale to 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/WebFloatPoint.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;
 
+    // Offset of emulated view inside available space, not in fit to view mode.
+    WebFloatPoint offset;
+
+    // Scale of emulated view inside available space, not in fit to view mode.
+    float scale;
+
     WebDeviceEmulationParams()
         : screenPosition(Desktop)
         , deviceScaleFactor(0)
-        , fitToView(false) { }
+        , fitToView(false)
+        , scale(1) { }
 };
 
 } // namespace blink
 
 #endif