[DevTools] Do not reset scroll when emulating device.

third_party/WebKit/Source/web/DevToolsEmulator.h

Index: third_party/WebKit/Source/web/DevToolsEmulator.h
diff --git a/third_party/WebKit/Source/web/DevToolsEmulator.h b/third_party/WebKit/Source/web/DevToolsEmulator.h
index c48c3a146c02ebe9490a03753a3cb4b4021b7fa6..fc25aa43e672c7c5eccdb659fc368334c84729b1 100644
--- a/third_party/WebKit/Source/web/DevToolsEmulator.h
+++ b/third_party/WebKit/Source/web/DevToolsEmulator.h
@@ -40,6 +40,8 @@ public:
     void setPrimaryPointerType(PointerType);
     void setAvailableHoverTypes(int);
     void setPrimaryHoverType(HoverType);
+    void setMainFrameResizesAreOrientationChanges(bool);
+    bool mainFrameResizesAreOrientationChanges() const;
 
     // Emulation.
     void enableDeviceEmulation(const WebDeviceEmulationParams&);
@@ -78,6 +80,7 @@ private:
 
     bool m_touchEventEmulationEnabled;
     bool m_doubleTapToZoomEnabled;
+    bool m_mainFrameResizesAreOrientationChanges;
     bool m_originalTouchEnabled;
     bool m_originalDeviceSupportsMouse;
     bool m_originalDeviceSupportsTouch;