Implement HiDPI support in Pepper dev interface

ppapi/thunk/ppb_graphics_2d_thunk.cc

Index: ppapi/thunk/ppb_graphics_2d_thunk.cc
diff --git a/ppapi/thunk/ppb_graphics_2d_thunk.cc b/ppapi/thunk/ppb_graphics_2d_thunk.cc
index 393b4c663d63bcde44c287a98be4cd89658ca7fe..8ddf0000c4d8f5ac59eeaf1d670bc648c235b904 100644
--- a/ppapi/thunk/ppb_graphics_2d_thunk.cc
+++ b/ppapi/thunk/ppb_graphics_2d_thunk.cc
@@ -5,6 +5,7 @@
 #include "ppapi/c/pp_completion_callback.h"
 #include "ppapi/c/pp_errors.h"
 #include "ppapi/c/ppb_graphics_2d.h"
+#include "ppapi/c/private/ppb_graphics_2d_private.h"
 #include "ppapi/thunk/enter.h"
 #include "ppapi/thunk/ppb_graphics_2d_api.h"
 #include "ppapi/thunk/resource_creation_api.h"
@@ -23,7 +24,23 @@ PP_Resource Create(PP_Instance instance,
   EnterResourceCreation enter(instance);
   if (enter.failed())
     return 0;
-  return enter.functions()->CreateGraphics2D(instance, *size, is_always_opaque);
+  return enter.functions()->CreateGraphics2D(instance,
+                                             *size,
+                                             is_always_opaque,
+                                             1.0f);
+}
+
+PP_Resource CreateWithScale(PP_Instance instance,
+                            const PP_Size* size,
+                            PP_Bool is_always_opaque,
+                            float scale) {
+  EnterResourceCreation enter(instance);
+  if (enter.failed())
+    return 0;
+  return enter.functions()->CreateGraphics2D(instance,
+                                             *size,
+                                             is_always_opaque,
+                                             scale);
 }
 
 PP_Bool IsGraphics2D(PP_Resource resource) {
@@ -88,11 +105,19 @@ const PPB_Graphics2D g_ppb_graphics_2d_thunk = {
   &Flush
 };
 
+const PPB_Graphics2D_Private g_ppb_graphics_2d_private_thunk = {
+  &CreateWithScale
+};
+
 }  // namespace
 
 const PPB_Graphics2D_1_0* GetPPB_Graphics2D_1_0_Thunk() {
   return &g_ppb_graphics_2d_thunk;
 }
 
+const PPB_Graphics2D_Private_0_1* GetPPB_Graphics2D_Private_0_1_Thunk() {
+  return &g_ppb_graphics_2d_private_thunk;
+}
+
 }  // namespace thunk
 }  // namespace ppapi