Fix blurry content after disabling dev tools emulation

third_party/WebKit/public/platform/WebLayerTreeView.h

Index: third_party/WebKit/public/platform/WebLayerTreeView.h
diff --git a/third_party/WebKit/public/platform/WebLayerTreeView.h b/third_party/WebKit/public/platform/WebLayerTreeView.h
index 6c2d5b6955b5a56213dc8a6ac1672ab419e56899..23243a62d6648a4aa1af85f4dcd2b17a06d8f95d 100644
--- a/third_party/WebKit/public/platform/WebLayerTreeView.h
+++ b/third_party/WebKit/public/platform/WebLayerTreeView.h
@@ -158,6 +158,10 @@ class WebLayerTreeView {
   // Mutations are plumbed back to the layer tree via the mutator client.
   virtual void setMutatorClient(std::unique_ptr<WebCompositorMutatorClient>) {}
 
+  // For when the embedder itself change scales on the page (e.g. devtools)
+  // and wants all of the content at the new scale to be crisp.
+  virtual void forceRecalculateRasterScales() {}
+
   // Input properties ---------------------------------------------------
   virtual void setEventListenerProperties(WebEventListenerClass,
                                           WebEventListenerProperties){};