Adds scroll position/scale emulation to DevTools.

third_party/WebKit/public/web/WebDeviceEmulationParams.h

Index: third_party/WebKit/public/web/WebDeviceEmulationParams.h
diff --git a/third_party/WebKit/public/web/WebDeviceEmulationParams.h b/third_party/WebKit/public/web/WebDeviceEmulationParams.h
index 85f9f7c466540104fcd230c409a7f8011188a696..1ab462a2341c70dad54b866fea7ab92872cc3416 100644
--- a/third_party/WebKit/public/web/WebDeviceEmulationParams.h
+++ b/third_party/WebKit/public/web/WebDeviceEmulationParams.h
@@ -53,6 +53,10 @@ struct WebDeviceEmulationParams {
     // Screen orientation angle, used together with screenOrientationType.
     int screenOrientationAngle;
 
+    // Emulated visual viewport size. |x == 0| or |y == 0| disables the override
+    // for the respective coordinate.
+    WebSize visualViewportSize;
+
     WebDeviceEmulationParams()
         : screenPosition(Desktop)
         , deviceScaleFactor(0)
@@ -66,7 +70,8 @@ inline bool operator==(const WebDeviceEmulationParams& a, const WebDeviceEmulati
 {
     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
-        && a.screenOrientationType == b.screenOrientationType && a.screenOrientationAngle == b.screenOrientationAngle;
+        && a.screenOrientationType == b.screenOrientationType && a.screenOrientationAngle == b.screenOrientationAngle
+        && a.visualViewportSize == b.visualViewportSize;
 }
 
 inline bool operator!=(const WebDeviceEmulationParams& a, const WebDeviceEmulationParams& b)