[DevTools] Add screen size and position 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 "../platform/WebFloatPoint.h"
+#include "../platform/WebPoint.h"
 #include "../platform/WebRect.h"
 #include "../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 mobile, |screenSize| and |viewPosition| are used.
     // For desktop, screen size and view position are preserved.
     enum ScreenPosition {
         Desktop,
         Mobile,
         ScreenPositionLast = Mobile
     };
 
     ScreenPosition screenPosition;
 
+    // Emulated screen size. Used with |screenPosition == Mobile|.
+    WebSize screenSize;
+
+    // Position of view on the screen. Used with |screenPosition == Mobile|.
+    WebPoint viewPosition;
+
     // 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;
 
     // 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)
         , scale(1) { }
 };
 
 inline bool operator==(const WebDeviceEmulationParams& a, const WebDeviceEmulationParams& b)
 {
-    return a.screenPosition == b.screenPosition && a.deviceScaleFactor == b.deviceScaleFactor && a.viewSize == b.viewSize && a.fitToView == b.fitToView && a.offset == b.offset && a.scale == b.scale;
+    return a.screenPosition == b.screenPosition && a.screenSize == b.screenSize && a.viewPosition == b.viewPosition && a.deviceScaleFactor == b.deviceScaleFactor && a.viewSize == b.viewSize && a.fitToView == b.fitToView && a.offset == b.offset && a.scale == b.scale;
 }
 
 inline bool operator!=(const WebDeviceEmulationParams& a, const WebDeviceEmulationParams& b)
 {
     return !(a == b);
 }
 
 } // namespace blink
 
 #endif