Adds DevTools commands for forced viewport override.

third_party/WebKit/Source/platform/testing/WebLayerTreeViewImplForTesting.cpp

Index: third_party/WebKit/Source/platform/testing/WebLayerTreeViewImplForTesting.cpp
diff --git a/third_party/WebKit/Source/platform/testing/WebLayerTreeViewImplForTesting.cpp b/third_party/WebKit/Source/platform/testing/WebLayerTreeViewImplForTesting.cpp
index 4157507c9d2c7aa4695cc92b09c74ab4a28b7a76..e639a103faaa74f32d503f266bc799cbcc6c3d9d 100644
--- a/third_party/WebKit/Source/platform/testing/WebLayerTreeViewImplForTesting.cpp
+++ b/third_party/WebKit/Source/platform/testing/WebLayerTreeViewImplForTesting.cpp
@@ -99,11 +99,23 @@ void WebLayerTreeViewImplForTesting::setViewportSize(const WebSize& deviceViewpo
     m_layerTreeHost->GetLayerTree()->SetViewportSize(gfxSize);
 }
 
+WebSize WebLayerTreeViewImplForTesting::getViewportSize() const
+{
+    return WebSize(
+        m_layerTreeHost->GetLayerTree()->device_viewport_size().width(),
+        m_layerTreeHost->GetLayerTree()->device_viewport_size().height());
+}
+
 void WebLayerTreeViewImplForTesting::setDeviceScaleFactor(float deviceScaleFactor)
 {
     m_layerTreeHost->GetLayerTree()->SetDeviceScaleFactor(deviceScaleFactor);
 }
 
+float WebLayerTreeViewImplForTesting::getDeviceScaleFactor() const
+{
+    return m_layerTreeHost->GetLayerTree()->device_scale_factor();
+}
+
 void WebLayerTreeViewImplForTesting::setBackgroundColor(WebColor color)
 {
     m_layerTreeHost->GetLayerTree()->set_background_color(color);