Implement HiDPI support in Pepper dev interface

webkit/plugins/ppapi/ppb_graphics_2d_impl.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 WEBKIT_PLUGINS_PPAPI_PPB_GRAPHICS_2D_IMPL_H_
 #define WEBKIT_PLUGINS_PPAPI_PPB_GRAPHICS_2D_IMPL_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
@@ skipping 33 matching lines @@
   // PPB_Graphics2D functions.
   virtual PP_Bool Describe(PP_Size* size, PP_Bool* is_always_opaque) OVERRIDE;
   virtual void PaintImageData(PP_Resource image_data,
                               const PP_Point* top_left,
                               const PP_Rect* src_rect) OVERRIDE;
   virtual void Scroll(const PP_Rect* clip_rect,
                       const PP_Point* amount) OVERRIDE;
   virtual void ReplaceContents(PP_Resource image_data) OVERRIDE;
   virtual int32_t Flush(
       scoped_refptr< ::ppapi::TrackedCallback> callback) OVERRIDE;
+  virtual bool SetScale(float scale) OVERRIDE;
+  virtual float GetScale() OVERRIDE;
 
   bool ReadImageData(PP_Resource image, const PP_Point* top_left);
 
   // Assciates 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(PluginInstance* new_instance);
 
   // Paints the current backing store to the web page.
@@ skipping 114 matching lines @@
 
   // When doing offscreen flushes, we issue a task that issues the callback
   // later. This is set when one of those tasks is pending so that we can
   // enforce the "only one pending flush at a time" constraint in the API.
   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_;
+
   base::WeakPtrFactory<PPB_Graphics2D_Impl> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PPB_Graphics2D_Impl);
 };
 
 }  // namespace ppapi
 }  // namespace webkit
 
 #endif  // WEBKIT_PLUGINS_PPAPI_PPB_GRAPHICS_2D_IMPL_H_