[DevTools] Handle emulation in embedder, call into web API.

content/renderer/render_view_impl.h

Index: content/renderer/render_view_impl.h
diff --git a/content/renderer/render_view_impl.h b/content/renderer/render_view_impl.h
index d06f0ade6d7d8a0750a0f38e243c60feb694b671..0abe5ed942e1880d7d438c2329c537e599f73091 100644
--- a/content/renderer/render_view_impl.h
+++ b/content/renderer/render_view_impl.h
@@ -509,9 +509,9 @@ class CONTENT_EXPORT RenderViewImpl
   void Initialize(const ViewMsg_New_Params& params,
                   CompositorDependencies* compositor_deps,
                   bool was_created_by_renderer);
-  void SetScreenMetricsEmulationParameters(float device_scale_factor,
-                                           const gfx::Point& root_layer_offset,
-                                           float root_layer_scale) override;
+  void SetScreenMetricsEmulationParameters(
+      bool enabled,
+      const blink::WebDeviceEmulationParams& params) override;
 
   // Do not delete directly.  This class is reference counted.
   virtual ~RenderViewImpl();