Drag image should always use the real device scale factor

third_party/WebKit/Source/web/ChromeClientImpl.cpp

Index: third_party/WebKit/Source/web/ChromeClientImpl.cpp
diff --git a/third_party/WebKit/Source/web/ChromeClientImpl.cpp b/third_party/WebKit/Source/web/ChromeClientImpl.cpp
index ab5b0e7b38da10ede99bb915ea7f6405b1e21267..4ad25df7a50c5bdb733bcb8b1501e946c5ce647c 100644
--- a/third_party/WebKit/Source/web/ChromeClientImpl.cpp
+++ b/third_party/WebKit/Source/web/ChromeClientImpl.cpp
@@ -581,6 +581,11 @@ float ChromeClientImpl::windowToViewportScalar(const float scalarValue) const
     return viewportRect.width;
 }
 
+float ChromeClientImpl::nonEmulatedDeviceScaleFactor() const
+{
+    return m_webView->client() ? m_webView->client()->nonEmulatedDeviceScaleFactor() : 1.f;
+}
+
 WebScreenInfo ChromeClientImpl::screenInfo() const
 {
     return m_webView->client() ? m_webView->client()->screenInfo() : WebScreenInfo();