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..29b573919d89f24d0f86d106dc99cd1d2705f3f2 100644
--- a/third_party/WebKit/public/web/WebDeviceEmulationParams.h
+++ b/third_party/WebKit/public/web/WebDeviceEmulationParams.h
@@ -53,20 +53,38 @@ struct WebDeviceEmulationParams {
     // Screen orientation angle, used together with screenOrientationType.
     int screenOrientationAngle;
 
+    // Scroll position of layout viewport. |x < 0| or |y < 0| disables the
+    // override for the respective coordinate.
+    WebPoint scrollPosition;
+
+    // Emulated visual viewport size. |x < 0| or |y < 0| disables the override
+    // for the respective coordinate.
+    WebSize visualViewportSize;
+
+    // Scroll position of visual viewport. |x < 0| or |y < 0| disables the
+    // override for the respective coordinate.
+    WebFloatPoint visualViewportPosition;
+
+    // Pinch-zoom scale of visual viewport. |visualViewportScale == 0| disables
+    // the override.
+    double visualViewportScale;
+
     WebDeviceEmulationParams()
         : screenPosition(Desktop)
         , deviceScaleFactor(0)
         , fitToView(false)
         , scale(1)
         , screenOrientationType(WebScreenOrientationUndefined)
-        , screenOrientationAngle(0) { }
+        , screenOrientationAngle(0)
+        , visualViewportScale(0) { }
 };
 
 inline bool operator==(const WebDeviceEmulationParams& a, const WebDeviceEmulationParams& b)
 {
     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.scrollPosition == b.scrollPosition
+        && a.visualViewportSize == b.visualViewportSize && a.visualViewportPosition == b.visualViewportPosition && a.visualViewportScale == b.visualViewportScale;
 }
 
 inline bool operator!=(const WebDeviceEmulationParams& a, const WebDeviceEmulationParams& b)