Adds DevTools commands for forced viewport override.

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

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef WebLayerTreeViewImplForTesting_h
 #define WebLayerTreeViewImplForTesting_h
 
 #include "cc/test/test_task_graph_runner.h"
 #include "cc/trees/layer_tree_host_client.h"
 #include "cc/trees/layer_tree_host_single_thread_client.h"
@@ skipping 25 matching lines @@
     bool hasLayer(const WebLayer&);
 
     // blink::WebLayerTreeView implementation.
     void setRootLayer(const blink::WebLayer&) override;
     void clearRootLayer() override;
     void attachCompositorAnimationTimeline(cc::AnimationTimeline*) override;
     void detachCompositorAnimationTimeline(cc::AnimationTimeline*) override;
     virtual void setViewportSize(const blink::WebSize& unusedDeprecated,
         const blink::WebSize& deviceViewportSize);
     void setViewportSize(const blink::WebSize&) override;
+    WebSize getViewportSize() const override;
     void setDeviceScaleFactor(float) override;
     void setBackgroundColor(blink::WebColor) override;
     void setHasTransparentBackground(bool) override;
     void setVisible(bool) override;
     void setPageScaleFactorAndLimits(float pageScaleFactor,
         float minimum,
         float maximum) override;
     void startPageScaleAnimation(const blink::WebPoint& destination,
         bool useAnchor,
         float newPageScale,
@@ skipping 42 matching lines @@
     void DidAbortSwapBuffers() override {}
 
 private:
     cc::TestTaskGraphRunner m_taskGraphRunner;
     std::unique_ptr<cc::LayerTreeHost> m_layerTreeHost;
 };
 
 } // namespace blink
 
 #endif // WebLayerTreeViewImplForTesting_h