[DevTools] Add screen size and position to WebDeviceEmulationParams.

public/web/WebDeviceEmulationParams.h

Index: public/web/WebDeviceEmulationParams.h
diff --git a/public/web/WebDeviceEmulationParams.h b/public/web/WebDeviceEmulationParams.h
index a55872ba8482621572a53deccb060fdd5f165cdb..c1e8f4ca842e2a4edacfe7949092d9ca2acdaf37 100644
--- a/public/web/WebDeviceEmulationParams.h
+++ b/public/web/WebDeviceEmulationParams.h
@@ -6,6 +6,7 @@
 #define WebDeviceEmulationParams_h
 
 #include "../platform/WebFloatPoint.h"
+#include "../platform/WebPoint.h"
 #include "../platform/WebRect.h"
 #include "../platform/WebSize.h"
 
@@ -13,7 +14,7 @@ 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,
@@ -23,6 +24,12 @@ struct WebDeviceEmulationParams {
 
     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;
 
@@ -47,7 +54,7 @@ struct WebDeviceEmulationParams {
 
 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)