Apply viewport to dip scale to Graphics2D, Compositor

content/renderer/pepper/pepper_graphics_2d_host.h

 // Copyright (c) 2012 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_GRAPHICS_2D_HOST_H_
 #define CONTENT_RENDERER_PEPPER_PEPPER_GRAPHICS_2D_HOST_H_
 
 #include <stdint.h>
 
 #include <vector>
@@ skipping 76 matching lines @@
 
   void SetScale(float scale);
   float GetScale() const;
   void SetLayerTransform(float scale, const PP_Point& transform);
   bool IsAlwaysOpaque() const;
   PPB_ImageData_Impl* ImageData();
   gfx::Size Size() const;
 
   void ClearCache();
 
+  void set_viewport_to_dip_scale(float viewport_to_dip_scale) {
+    DCHECK_LT(0, viewport_to_dip_scale_);
+    viewport_to_dip_scale_ = viewport_to_dip_scale;
+  }
+
  private:
   PepperGraphics2DHost(RendererPpapiHost* host,
                        PP_Instance instance,
                        PP_Resource resource);
 
   bool Init(int width,
             int height,
             bool is_always_opaque,
             scoped_refptr<PPB_ImageData_Impl> backing_store);
 
@@ skipping 89 matching lines @@
   bool offscreen_flush_pending_;
 
   // Set to true if the plugin declares that this device will always be opaque.
   // This allows us to do more optimized painting in some cases.
   bool is_always_opaque_;
 
   // Set to the scale between what the plugin considers to be one pixel and one
   // DIP
   float scale_;
 
+  // The scale between the viewport and dip.
+  float viewport_to_dip_scale_ = 1.0f;
+
   ppapi::host::ReplyMessageContext flush_reply_context_;
 
   bool is_running_in_process_;
 
   bool texture_mailbox_modified_;
 
   // This is a bitmap that was recently released by the compositor and may be
   // used to transfer bytes to the compositor again.
   std::unique_ptr<cc::SharedBitmap> cached_bitmap_;
   gfx::Size cached_bitmap_size_;
 
   friend class PepperGraphics2DHostTest;
   DISALLOW_COPY_AND_ASSIGN(PepperGraphics2DHost);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_PEPPER_PEPPER_GRAPHICS_2D_HOST_H_