Apply viewport to dip scale to Graphics2D, Compositor

content/renderer/pepper/pepper_compositor_host.h

 // Copyright 2014 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 CONTENT_RENDERER_PEPPER_PEPPER_COMPOSITOR_HOST_H_
 #define CONTENT_RENDERER_PEPPER_PEPPER_COMPOSITOR_HOST_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 33 matching lines @@
   // Associates this device with the given plugin instance. You can pass NULL
   // to clear the existing device. Returns true on success. In this case, a
   // repaint of the page will also be scheduled. Failure means that the device
   // is already bound to a different instance, and nothing will happen.
   bool BindToInstance(PepperPluginInstanceImpl* new_instance);
 
   const scoped_refptr<cc::Layer> layer() { return layer_; };
 
   void ViewInitiatedPaint();
 
+  void set_viewport_to_dip_scale(float viewport_to_dip_scale) {

[bbudge, 2016/05/11 17:42:19]

DCHECK here for viewport_to_dip_scale != 0?

[oshima, 2016/05/11 18:18:15]

Added DCHECK_LT(0, viewport_to_dip_scale);

+    viewport_to_dip_scale_ = viewport_to_dip_scale;
+  }
+
  private:
   void ImageReleased(int32_t id,
                      std::unique_ptr<base::SharedMemory> shared_memory,
                      std::unique_ptr<cc::SharedBitmap> bitmap,
                      const gpu::SyncToken& sync_token,
                      bool is_lost);
   void ResourceReleased(int32_t id,
                         const gpu::SyncToken& sync_token,
                         bool is_lost);
   void SendCommitLayersReplyIfNecessary();
@@ skipping 31 matching lines @@
     LayerData(const LayerData& other);
     ~LayerData();
 
     scoped_refptr<cc::Layer> cc_layer;
     ppapi::CompositorLayerData pp_layer;
   };
   std::vector<LayerData> layers_;
 
   ppapi::host::ReplyMessageContext commit_layers_reply_context_;
 
+  // The scale between the viewport and dip. This differs in
+  // use-zoom-for-dsf mode where the content is scaled by zooming.
+  float viewport_to_dip_scale_ = 1.0f;
+
   base::WeakPtrFactory<PepperCompositorHost> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PepperCompositorHost);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_PEPPER_PEPPER_COMPOSITOR_HOST_H_