[DevTools] Add offset and scale to WebDeviceEmulationParams.

public/web/WebDeviceEmulationParams.h

Index: public/web/WebDeviceEmulationParams.h
diff --git a/public/web/WebDeviceEmulationParams.h b/public/web/WebDeviceEmulationParams.h
index 0816ca659528ed3b12e898df6341f7ecfb876cb1..ac4dbbd78d81b029df629de7f76542e2e654c9d1 100644
--- a/public/web/WebDeviceEmulationParams.h
+++ b/public/web/WebDeviceEmulationParams.h
@@ -5,6 +5,7 @@
 #ifndef WebDeviceEmulationParams_h
 #define WebDeviceEmulationParams_h
 
+#include "public/platform/WebFloatPoint.h"
 #include "public/platform/WebRect.h"
 #include "public/platform/WebSize.h"
 
@@ -33,10 +34,17 @@ struct WebDeviceEmulationParams {
     // 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