Implement HiDPI support in Pepper dev interface

ppapi/proxy/ppapi_messages.h

Index: ppapi/proxy/ppapi_messages.h
diff --git a/ppapi/proxy/ppapi_messages.h b/ppapi/proxy/ppapi_messages.h
index cd54ae96c3f12e95a911dd7ecc6c7082b59db0cc..bf86c7f096b9da77fd302a02e48a30d555656443 100644
--- a/ppapi/proxy/ppapi_messages.h
+++ b/ppapi/proxy/ppapi_messages.h
@@ -143,6 +143,8 @@ IPC_STRUCT_TRAITS_BEGIN(ppapi::ViewData)
   IPC_STRUCT_TRAITS_MEMBER(is_fullscreen)
   IPC_STRUCT_TRAITS_MEMBER(is_page_visible)
   IPC_STRUCT_TRAITS_MEMBER(clip_rect)
+  IPC_STRUCT_TRAITS_MEMBER(device_scale)
+  IPC_STRUCT_TRAITS_MEMBER(css_scale)
 IPC_STRUCT_TRAITS_END()
 
 IPC_STRUCT_TRAITS_BEGIN(ppapi::Preferences)
@@ -845,6 +847,10 @@ IPC_MESSAGE_ROUTED2(PpapiHostMsg_PPBGraphics2D_ReplaceContents,
                     ppapi::HostResource /* image_data */)
 IPC_MESSAGE_ROUTED1(PpapiHostMsg_PPBGraphics2D_Flush,
                     ppapi::HostResource /* graphics_2d */)
+IPC_SYNC_MESSAGE_ROUTED2_1(PpapiHostMsg_PPBGraphics2D_Dev_SetScale,

[brettw, 2012/06/19 20:21:27]

Don't make this a sync message and just remove the "result". If we already
validated the resource on the plugin side, it should be almost impossible for it
to fail, and sync messages are much higher overhead.

[Josh Horwich, 2012/06/19 23:56:15]

Done.

+                           ppapi::HostResource /* graphics_2d */,
+                           float /* scale */,
+                           bool /* result */)
 
 #if !defined(OS_NACL)
 // PPB_Graphics3D.