Fix blurry content after disabling dev tools emulation

cc/trees/layer_tree_host.h

 // Copyright 2016 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 CC_TREES_LAYER_TREE_HOST_H_
 #define CC_TREES_LAYER_TREE_HOST_H_
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "cc/base/cc_export.h"
@@ skipping 101 matching lines @@
 
   // Requests a main frame update and also ensure that the host pulls layer
   // updates from the client, even if no content might have changed, without
   // forcing a full commit synchronization.
   virtual void SetNeedsUpdateLayers() = 0;
 
   // Requests that the next main frame update performs a full commit
   // synchronization.
   virtual void SetNeedsCommit() = 0;
 
+  // Requests that the next frame re-chooses crisp raster scales for all layers.
+  virtual void SetNeedsRecalculateRasterScales() = 0;
+
   // Returns true if a main frame (for any pipeline stage above) has been
   // requested.
   virtual bool BeginMainFrameRequested() const = 0;
 
   // Returns true if a main frame with commit synchronization has been
   // requested.
   virtual bool CommitRequested() const = 0;
 
   // Enables/disables the compositor from requesting main frame updates from the
   // client.
@@ skipping 66 matching lines @@
   virtual void SetNextCommitWaitsForActivation() = 0;
 
   // The LayerTreeHost tracks whether the content is suitable for Gpu raster.
   // Calling this will reset it back to not suitable state.
   virtual void ResetGpuRasterizationTracking() = 0;
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_LAYER_TREE_HOST_H_